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JBL Synchros E40BT

On-ear Bluetooth® headphones (White)

Item #: 109E40BTW

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31 Reviews

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JBL Synchros E40BT

Earcup buttons keep you in control of music and calls when you're listening wirelessly with the Synchros E40BT (shown in Red).

Bluetooth on a budget

You don't have to spend a lot of money to get headphones with Bluetooth wireless connectivity and good sound. The JBL Synchros E40BT delivers both at an impressively low price. They're cleverly styled, well built, and offer JBL's legendary sound, with PureBass technology ensuring your music has plenty of low-frequency power. Stow your smartphone in your pocket and listen wirelessly, using the the earcup controls to play and pause music, adjust the volume, or even take a hands-free call with the built-in microphone.

Wireless or wired listening

The Synchros E40BT run on a built-in rechargeable battery, which provides up to 16 hours of use. If your battery runs down, you won't be stuck without music. Simply connect the included headphone cable and keep listening in wired mode. Then, use your computer or a USB AC charger to get your headphones charged up for more wireless use.

Share a song wirelessly

One pair of E40BT headphones is cool. Two pairs can do something really cool. You can stream music to another pair of headphones wirelessly using JBL's ShareMe™ technology. This allows two people to listen to the same song from the same source at the same time. You can share music with any two pairs of ShareMe compatible headphones.

Product Highlights:

  • 40mm dynamic drivers
  • Bluetooth 3.0 and A2DP connectivity for wireless music listening and phone calls with compatible smartphones
  • earcup buttons offer music, volume, and call controls for compatible Bluetooth connected smartphones
  • built-in earcup microphone with echo-cancellation for clear, hands-free calls with a smartphone
  • PureBass technology delivers low-frequency response with detail and accuracy
  • ShareMe technology allows you to stream music wirelessly to a second pair of ShareMe compatible headphones
  • includes miniplug headphone cable for wired listening (disables Bluetooth functionality)
  • earcups swivel and fold flat for easy storage
  • built-in rechargeable battery provides up to 16 hours of music listening
  • USB charging cable included
  • frequency response: 20-22,000 Hz
  • impedance: 32 ohms
  • warranty: 1 year
  • Our 60-day money-back guarantee

JBL Synchros E40BT Reviews

Average Customer Review:

31 reviews
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Great "wireless" headphones if they are plugged in...

Written By UMMMHELLO, CHICAGO,IL on Monday, May 25, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Great looking and sounding headphones (for the price) with a rather large caveat. Wanted to give them a better review but they only rreach their full potential when plugged in via included wire; I don't know if its just me but would have liked the audio jack to have been on the right cup. I use then for my 27" iMac who's audio port is on the right so the cord winds up resting across my chest and in the way of my mouse. Annoying but because cord is so light after a while I don't notice it. The reason for the llow review...the Bluetooth. What can I say, it's really lacking. Bought these as a cheap option for a wireless set of cans but very disappointed by the Bluetooth sound quality. Very flat and just has no punch. Leaves me using my "wireless" cans as corder headphones 90% of the time, which of course defeats the purpose of them being wireless. They do look great and the cups have a nice swivel capability that makes them very comfortable even when I'm wearing glasses. I honestly would have returned them because my intent was to purchase a cheap decent WIRELESS headset, but because the sound quality is there for the price on any similar corded pair I decided tokeep them because if I absolutely have to walkaway from my Mac, I do at least have that option. Moral of the story is, if you are looking for a great sounding pair of WIRELESS headphones don't be cheap like me and fork down more of you hard earned cash on something else.

Pros: Great feel and look. Very decent sound for the price if its used as a corded set.

Cons: Bluetooth qualityWould have preffered audio jack to have been on right ear cup.

Solid Performance

Written By Bob W, California on Tuesday, April 07, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • rating
    Noise Reduction
  • Sound Quality

JBL Synchros headphones are solid performers especially given the $100 price tag. First, they are bluetooth-capable. I have become a big fan of bluetooth headphones since making the switch on my last phones. The JBLs link up with no problems to my Android phone. Battery life is good; probably in the 10-15 hour range as advertised. (I have found that listening to them fully charged enhances the sound to some degree.) My prior headphones were a pair of Beats Wireless so the switch to the JBLs took some getting used to. Beats, of course, are known for their bass and the JBLs do not have the same boost on the bass end. That being said, I have grown to like the more balanced sound of the JBLs. I find the fit very comfortable and the controls to be simple. Using them to take phone calls is no problem. I can hear those on the other end and vis versa. Definitely recommend.

Pros: Good balanced sound, good fit, good value for Bluetooth headphones.

Cons: Wish they had a carrying case.

Quality under a $100

Written By Benjie B, Washington on Tuesday, March 31, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

You can't go wrong with JBL brand. For the money, the sound wasn't a disappointment. It looks great and it delivers. The only thing I didn't like is the ear cup it too small. After using it for a while my ears are starting to hurt. Otherwise, this item is a steal :)

Pros: Sounds great and pairing to a similar headphone is a cool feature.

Cons: It could use more padding for ear or a bigger ear enclose.

JBL Synchros E40BT

Written By Anonymous, Memphis,Tn on Monday, March 30, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

I think this is a great headset for the price range its in. The sound quality is good. I use it with my Android based phone and tablets and my Windows laptop. I know this may seem trivial but I really like how with just one quick press of the control on the headset it turns off or on. Pairing is easy and quick and the range seems fine. The only thing that surprised me is the connector on the headset you use for charging is not usb. They provide a cable with a standard full size USB on one end but on the other end is 3.5mm for the headset. If you lose your cable or forget it while traveling you are out of luck. They provide a standard audio 3.5mm cable also for wired sound that plugs into the same connector that is used for charging. Wish they would have used a micro USB on the headset instead. Have had more comfortable headsets before but after using it for a while it became more comfortable, not as tight.

At long last

Written By Peddler, Charlotte on Sunday, February 15, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

In the process of raising a family the music that was always a part of my life was put on hold. These headphones allow me the freedom to roam the house without being tethered to a cord and they bring the music I miss so much back in the way I enjoy hearing it... loud and clear. I had the 50BT's but they prevented me from hearing any of the goings on around the house. That, plus the over-the-ear style of the 50's were less than comfortable when wearing glasses while tying flies. The E40BT 'phones are simply way more than I expected in headphones... they sound fantastic, were a snap to pair and are very comfortable. I'm glad I found them and very glad Crutchfield gave me the chance to try them.

Pros: Comfort, pairing ease, price and sound quality.

Cons: A bit overboard on the JBL logo's but that's about it in my book.

Great Headphones!

Written By Anonymous, Wisconsin on Monday, January 26, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Overall, they were exactly what I wanted: wireless/bluetooth, comfortable, over the ear and great sound. I read a lot of reviews before purchasing and bought the E50 for my fiance for Christmas. He loves his, but I opted to go down one model and wasn't disappointed. They are smaller than the E50 but I have smaller ears, so that doesn't bother me. They are all they advertise to be and worth every penny compared to spending 3 times the money on a more "popular" brand. The sharing feature worked great while traveling as we could listen to the same thing from one device on both of our headphones.

Pros: -wireless -easy to use -sound quality -comfort -customer service from Crutchfield

Cons: -E40 are a little less solidly built than E50 but to be expected for price difference

JBL Synchros E40BT

Written By Anonymous, Meridian, ID on Sunday, January 18, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Great value for money, love them able to use at gym without carrying my phone.

JBL Synchros E40BT

Written By Anonymous, Dayton, OH on Monday, January 12, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Good sound. Good value

love them

Written By Natalie, Fresno,ca on Sunday, January 11, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

I bought these for my husband birthday and he loves them. They work so good and the Bluetooth reaches far. The customer service was GREAT ??

Pros: LOVE THE COLOR AND SOUND

Cons: NONE

Why Pay More?

Written By MikeR, Ohio on Saturday, January 10, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Bluetooth, AND noise reducing, for the price, are you kidding?

Pros: Great sound for the price.

Cons: Nothing to complain about at this time... seem to be a good product.

JBL Synchros E40BT

Written By xynobis, St. Pete, FL on Friday, January 09, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

This is a good set for the money, sound is good, quality seems to be good. Hopefully the "leather" will last a long time and doesn't fall apart anytime soon. Had them on for about 3 hours straight and my ears did not hurt, so they're quite comfortable. They pair really quick and without any problems.

Pros: Good design, sound, cables to hook'em up if you're out of juice.

Cons: None at this point.

jbl synchros bluetooth headphones

Written By Anonymous, Oxnard, CA on Tuesday, January 06, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Awesome shipping time. Received on time before Christmas.

Pros: Easy to sync. Very comfortable, very easy to use. Great sound.

Cons: Could be a little louder.

JBL Synchros E40BT

Written By Engobo, San Diego, CA on Saturday, January 03, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Great overall product for the price. I like the simplicity of the design; functional yet cool. Love the fact that you can use it both wireless or wired for those times you have extended beyond your battery's life! Also like that the charging cable uses the same input jack as for the wired RCA jack.

JBL Synchros E40BT

Written By Rhino, Cassville, GA on Thursday, January 01, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Good Value for the price for Bluetooth abliliry. Could use some higher volume levels.

Pros: Good value for Bluetooth

Cons: Volume could use some increased ability.

Best Bluetooth Headphones Ever Owned

Written By Anonymous, Louisiana on Monday, December 29, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

The sound quality is amazing and I LOVE the bass when needed. I was everything I expected and more from JBL! You cannot go wrong with this headphones!

Pros: Wireless. Awesome bass. Noise reduction.

awesome

Written By Anonymous, hay fork ca on Monday, December 29, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Bought these for granddaughter for Christmas. She says " These really bump". Glad she really likes them.

Best bang for your buck

Written By Ernie, Cross lanes wv on Sunday, December 28, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Shopped everywhere for Bluetooth headphones for my 13 year old daughter. She destroyed a pair of cheaper feeling Beats last year so wireless is a huge plus (you can use a cord if you need too). I figured if JBL can make sound systems for Ferrari and Lexus, they can make a quality set of headphones. So far, I am right.

Pros: Great sound. Easy to use. The blue stands out. Very affordable compared to "popular" companies, and they feel much more solid built.

Cons: None yet

daughter loved it!!!!

Written By JeffD, Felton, DE on Sunday, December 28, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Great Headphones!!!! JBL has be known in the past and present to produce awesome products! this is no different. bluetooth, great sound quality, user friendly, absolutely looks sharp, long battery life (16 hours), quickly charged, comfortable, affordable, my teen daughter loves them. My daughter walks around the house wearing the headphones while her iPad seats in her room. I love the wireless technology. A great gift for any teen daughter that loves music.

Pros: affordable, user friendly, bluetooth, great sound, not bulky, comfortable, looks great and you can choose from different colors. Thank you JBL and Thank you Crutchfield for your customer service! Most Excellent!!! my daughter loves the headphones and she is happy! and that matters...

Wireless JBL E40BT

Written By John, CT on Sunday, December 28, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Perfect sound and no wires. Battary long lasting for 16 hours. Perfect and love it.

Pros: No Wires and good price compare to others.

Cons: None

Very Nice

Written By ALEXM, California on Sunday, December 14, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

My husband got these for me as an early xmas present. I do a lot of house cleaning (obviously) and I love how these are wireless and terrific sound. I love my JBL's over ear headphones.

Pros: Lightweight awesome sound quality comfortable affordable

Cons: Not much to say in this department

JBL's Bluetooth Headphones E40BT Review

Written By stupenndus, Connecticut on Saturday, December 13, 2014

Crutchfield Customer Review (What's this?)

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The audio industry has been slow to introduce Bluetooth headphones into the market place and I have waited patiently to find a product that is of sufficient quality and reliability at a reasonable price to announce "Bluetooth Headphones are now a serious contender". It is true that there were a few Bluetooth headphones at or below the $100 price point last year, but it was tough to sift through the good from the bad. Recently I spotted these headphones on the Crutchfield site and started to get excited that a reliable name brand manufacturer of budget, well balanced speakers, for at least the last three decades, have entered into the Bluetooth headphone market. I ordered a pair. They arrive in a nicely packaged box which reminds me of how Apple package their products. They come complete with two wire connectors - one which is for recharging (which is not intended for USB audio connection) and an optional way to directly connect between your audio device and the headphones in a conventional fashion. The build quality is very solid and gives the impression that they will last for a decent length of time. These headphones rotate about vertical access on each side so you can adjust the angle to better fit your hears. Connecting them up the computer or mobile phone was simple and reliable - as if years of fine tuning had been applied to the design. Sound quality was impressively balanced and very listenable for a detailed review of my favorite music. Get a pair

Pros: Easy to connect to a Bluetooth transmitting/receiving device and then reconnect later on. Microphone for ease of use with your mobile phone Easy to adjust volume control Ability to add a second set of Headphones for two people to share the same Bluetooth streaming device Well balanced frequency range with respectable clarity and depth (treble and bass)

Cons: Overall comfort when worn for longer than an hour or so - since these headphones sit on your ears they can begin to ache after a certain period of time. This is typical with any headphones of this type. I found that the headphones sounded better when reversed - so that the Left side was on the right ear. This may be due to my inbalance of frequency range between left and right ears. However reversing them means that the microphone is now facing the back of your head away from the mouth.

jbl synchros e40bt

Written By Angelo C., ft myets, Florida 33913 on Thursday, December 11, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Awesome product. Sleek and comfortable.

Pros: Good sound and looks good.

Cons: It would have been nice to come with a carrying case.

JBL Synchros E40BT

Written By astash, Ohio on Sunday, December 07, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

very well built, a little on the heavy side, very easy to set up and user friendly.

Pros: well built, simple to use, easy operation, great battery life.

Cons: seem a little heavy, might just be me, not used to wearing full size headphones.

Great Headphones with Bluetooth bonus

Written By ChrisP, Katy, TX on Friday, November 14, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

These headphones have exceeded my expectations. For the money, these are great headphones and bluetooth on top of that. They are designed and built well to be sturdy and easy to manipulate, but also handle being stuffed in a bag while traveling. They are comfortable and may be adjusted in and out so as to fit the head better so that the cans sit properly on the ears. Additionally, while not "over the ear", the design and size of these is ideal where it rests on the ear while blocking out external sound like an over the ear. These also adjust easily to be worn comfortably over one ear at a time. I've been wearing them for practically 2 days straight with little/no discomfort. I love the simplicity of the display (one LED) and controls (up, down for volume/ one primary control for pause/play/skip). The design of the "bezel" around the controls provides for protection from inadvertently tapping the control while adjusting the phones on your head. I had them paired to my device and up and running in literally 2 minutes after opening the box. Finally and most importantly, the sound is really good- better than expected. I know there is better, but the bass is deep and clear, and clear highs. The mid could have a bit more depth. But I can't imagine others that cost 3X+ being that factor of quality in sound.

Pros: Solid construction while lightweight. Simple controls that actually work as designed. Great sound for a bluetooth device.

Cons: A bit tricky going from one paired source to another but that is most likely more of a source issue than the design of the headphones. Nothing else identified so far.

Technically good but not comfortable

Written By phung, Miami, FL on Tuesday, October 28, 2014

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

From a technical perspective, the sounds is good. Bluetooth sync was easy. Listening to music or talking on the phone sounds good

Pros: Hands free headset, talking on the phone via bluetooth

Cons: Not comfortable over the ears after a few minutes. The ear muffs cannot be adjusted, so they pinch your ears at the bottom.

JBL Synchros E40BT

Written By michael, Uvalde, TX on Sunday, September 28, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
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  • Comfort
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Very nice blue tooth head set

Pros: Good quality

Cons: The ear pads are small, don't cover the entire ear.

Great headphones

Written By PeterW, Hockessin, DE on Thursday, September 18, 2014

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I have several hundred classical CDs on my laptop. I can listen to them anywhere but was always tethered to the device. With the JBLs I can go anywhere within about 30 ft of the computer and hear the same great sound. The headphones are comfortable, easy to connect by Bluetooth and, to my ears, are as good in sound quality as any of the higher priced headphones I have. I'm getting much more enjoyment our of my music collection. I did not test with a smartphone.

Pros: Comfortable, easy to connect, excellent sound with fine bass. As good at reducing surrounding noise as any of my non-noise canceling headphones.

Cons: About 30 ft range with my laptop - quite adequate for me.

JBL Synchros E40BT

Written By MICHELLE, CENTRE, AL on Friday, September 12, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

The price for these bluetooth headphones is the selling point. I purchased these for my 11 year old daughter and they are awesome. They are definitely worth the money compared to it's counterparts and you won't be paying an arm and a leg for these as you would be for those.

Pros: Price, quality of build, color choices

Cons: I would like a little more bass but they are loud enough for my daughter.

JBL Bluetooth Headphone

Written By DAVES, Virginia Beach, VA on Saturday, September 06, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

I like to use headsets especially when I'm going for a walk or working in the yard. I thought it would be nice not to have to fiddle with a cord especially when I'm trimming shrubs and the like around the house. Cords can easily get in the way and possibly cut by accident. I didn't expect the quality of the bluetooth sound to be as good as a corded set, but I was was very pleasantly surprised as how great these sounded. They also fit snug so they can be heard over lawnmower noise. I haven't tried using he phone setup yet. But, I'm very happy with the sound quality of music and audiobooks.

Pros: Great sound. Outside noise is muted because of snug fit.

Cons: They tend to fall off if you're bending over a lot picking things up while working in the yard.

Great Purchase !!

Written By Danny, 40065 on Sunday, August 31, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

I could not have asked for a better set of Bluetooth headphones . Sync with ease to everything I've tried as of yet . Great sound , and functions as they should .... Thanks yet again Crutchfield for another awesome purchase !!!

Pros: None

Cons: None

JBL Bluetooth Headphones

Written By Webb, Mequon, WI on Sunday, August 31, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Great value when compared to Bose

Pros: Quality look and materials

Cons: No noise canceling

Hands-on research

What's in the box?

Download owner's manual

  • On-ear Bluetooth headphones (white)
  • 50" Straight audio cable (straight 2.5mm plug on one end and a right angled 3.5mm plug on other end)
  • 40" Straight USB cable for charging (straight 2.5mm plug on one end and Type A USB plug on other end)
  • Quick Start Guide
  • Warranty sheet

Features and Specs

General
Fit Style On-ear
Earcup Type Closed
Noise-canceling No
Bluetooth Yes
Frequency Response 20-22k Hz
Sensitivity 114 dB
Impedance 32 Ohms
Weight 7.23 ounces
Cord Length 40"
Airline Adapter Included No
iPod Control Yes
Volume Control Yes
Built-in Microphone Yes
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research

Features

Overview: The JBL Synchros E40BT Bluetooth headphones offer convenience and performance in one stylish and comfortable package. With ShareMe technology, you can even share your experience with another set of headphones. The E40BTs have a built-in Lithium-ion rechargeable battery that provides all day music playback capability. When the battery becomes exhausted, you can plug in the supplied auxiliary cable and continue listening.

Drivers: The Synchros E40BT over-the-ear headphones feature large 40mm drivers with PureBass performance in a lightweight closed design. The 32-ohm drivers give you crystal-clear stereo for enjoying your music or carrying on a phone conversation.

Bluetooth: The Synchros E40BT supports Bluetooth 3.0, with A2DP v1.3, AVRCP v1.5, HFP v1.6, and HSP v1.2. The left ear cup is equipped with a microphone featuring Konnexx echo-cancellation technology to give you a clean connection and clear, hands-free calling. The headphones are compatible with iPad (mini, 3rd and 4th gen), iPhone (5s, 5c, 5, and 4s), iPod touch, MacBook Air, MacBook Pro, Mac mini, Android 1.5 Cupcake to Android 4.4 KitKat, and Blackberry 1.0 to Blackberry 10 OS.

ShareMe: JBL's exclusive ShareMe technology lets you wirelessly and simultaneously share your music with another ShareMe-enabled headphone. When you are paired with a Bluetooth source device, you can then add a second pair of headphones and listen to the same source at the same time--a concert for two. ShareMe can be enabled using two E40BT headphones, a E40BT and an E50BT, or two E50BT headphones.

On-board Controls: The headphones' left ear cup includes a 4-way Multi-function Button (MFB) that lets you control your music playback and phone calls:

  • Press MFB up/down: Raises volume up or down
  • Press MFB forward:
    • Music: 1x play/pause; 2x next track; 3x previous track
    • Phone Calls: short press answer call; long press reject call; manage 2 calls at same time
  • Press and hold MFB forward: 1x fast forward; 2x fast reverse
  • Press MFB backward: ShareMe function

Battery: The built-in 3.7V Lithium-ion rechargeable battery (610 mAh) provides approximately 16 hours of music playback time, or 24 hours of phone talk time. The battery charges in approximately 3 hours via the included USB cable.

Specifications: The Synchros E40BT has the following specs:

  • Frequency Response: 20-22kHz
  • Maximum SPL: 114dB @ 30mW
  • Impedance: 32 ohms
  • BT Frequency Range: 2.402 - 2.480 GHz
  • Weight: 7.23 ounces

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.