Your cart
Contact us
Close contact box
Connect ID #
360 363 812 4
Connect ID #
360 363 812 4
All finished with your chat session?

We’ll email you a transcript of this conversation for your records.

Our contact center is currently closed.

Please enter your name.  
Please enter a valid email address. Why is this required?

For Tech Support, call 1-888-292-2575

All web chat conversations are recorded. We use automated technology to connect you with an Advisor and to answer some common questions. If you do not consent, please do not continue with chat assistance.

Thank you, !
Our conversation will be emailed to
Chat Advisor Image

Your Advisor,

More about me
Please enter a question  
Don't wait on hold. We'll call you back when it's your turn to talk with the next available .
Please enter your name  
Please enter your phone number  
Please enter a message  

Calls may be recorded for training and quality control purposes.

We are located in Virginia USA.

Sennheiser HDR 120

Extra headset for RS 135-9 wireless headphone system

Item # 143HDR120

California customers:
Please click here for your Proposition 65 warning.

Discontinued item
6 questions - 14 answers

Item # 143HDR120

Free lifetime tech support

Whenever you need a hand.

Need an expert?

Our Advisors know their stuff and love to help.

Articles, videos & DIY info

Decades of expertise at your fingertips.

About the Sennheiser HDR 120

Add an extra HDR 120 headset (or even two or three) to your Sennheiser RS 135-9 wireless headphone system and share the fun. Its open design delivers warm, detailed sound with plenty of bass. Cushioned earpads and headband make it comfortable to wear for hours.

Product highlights:

  • add-on headset for use with Sennheiser's RS 135-9 wireless headphone system (sold separately)
  • RF wireless receiving range: up to 328 feet
  • each headset features a volume control, on/off switch, and tuning button
  • frequency response: 22-19,500 Hz
  • headphones use 2 "AAA" NiMH rechargeable batteries (included)
  • requires transmitter/base-station from RS 135-9 system for use
  • headset weight: 8.1 oz.
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # 009931

What's in the box:

  • HDR-120 Wireless on-the-ear headset
  • 2 "AAA" Ni-MH rechargeable batteries (1.2V/600 mAh)
  • Instructions (English/ German/ French/ Italian/ Spanish/ Portuguese/ Dutch/ Finnish/ Greek)
  • RS 120 connection diagram

Customer reviews

Loading reviews...

Sennheiser HDR 120 reviews

Average review:

24 reviews

Thanks for submitting your review

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee review (What's this?)



Crutchfield response

<< >>

More details on the Sennheiser HDR 120

Mark G.

Product Research


Overview: The HDR 120 can be used as an additional headset for the Sennheiser RS 135-9 wireless headphone system with an open air, on-ear design. They are also compatible with the RS 120 and RS 110 wireless headphone systems.

Batteries: Power for the headset is provided by two rechargeable "AAA" batteries (included) that fit into a compartment in the headset. The batteries are recharged whenever the headset is placed on the transmitter included with the RS 135-9 system. Fully charged batteries have an operating time of approximately 20 hours. The RS 135-9 system manual recommends an initial charging of 24 hours before the batteries are first used, after that the normal charging time is approximately 18 hours.

Note: Only rechargeable batteries should be used.


  • Volume: thumbwheel volume adjustment; on the right earcup
  • Tuning: tune the headset to the transmitter for the clearest reception; on the right earcup
  • Power: turn the headset on/off; on the left earcup


  • Reception Frequency: 926-928 MHz
  • Modulation: FM stereo
  • Frequency Response: 22-19,500 Hz
  • Maximum SPL: 106 dB
  • Weight: 8.1 oz

Loading accessories...

Customer Q&A

6 questions already asked

I have a Samson smart tv. sometimes after using my headphones the tv sound will turn off. how do I correct this? worked great on my old Samson tv,
[ Ed  Dec 30, 2020 ]
1 answer
The way my equipment is set up, I listen to the sound on the tv (I believe from my cable box) though my receiver. The Senheisser headphones work perfectly with this set up. The volume is controlled by the receiver and the headphones. I bypass the tv volume and do not use it to get sound.
[ GARY  Dec 30, 2020 ]
No sound in the head set. I have checked all of the connections and all are ok. The green led light is not coming on when the TV is turned on. I do have static in the headset. I have adjusted the tuning knob several times with no sound, What can I do?
[ Rich  Mar 21, 2020 ]
3 answers
Some possibilities: 1. Recharge the headset by placing it on the cradle for at least 24 hours. (When I recharge the headset, I first turn the sound knob on the headset to the off position.) 2. If the above doesn't work, you can try replacing the batteries on the headset with 2 fresh AAA rechargeable batteries. If the new batteries are not pre-charged, place the headset with the new rechargeable batteries on the cradle (with the headset sound knob in the off position) for at least 24 hours before use.
[ GARY  Mar 23, 2020 ]
Simple question, but have you changed the batteries?
[ Paris M.  Mar 21, 2020 ]
The green light in my receiver has been out since I got it. Both my headphones worked fine till about a week ago. Spoke with Zane at Crutchfield and he sent me a new one. Received it a couple days ago and both 120 and 135 headphones work perfectly now.
[ Ronald  Mar 21, 2020 ]
no sound, I put new batteries in, still no sound? what can I do?
[ Kay  Apr 03, 2019 ]
7 answers
Do you have static if the TV is not turned on. You should if it is tuned properly, and audio turned up. If no, chances are the transmitter is not transmitting. Try a different channel on the transmitter. Are you getting audio out of the TV? Try swapping left and right channels. Sounds odd, but try licking the positive end of the batteries. Saliva is a conductor. Hope something works.
[ Paris M.  Apr 04, 2019 ]
Addendum to my earlier email answer: The customer mentioned that she put in new batteries. In order for the headphones be charged/recharged on the cradle, I believe that only rechargeable batteries as those that come with the headphones should be used.
[ GARY  Apr 04, 2019 ]
According to the instructions, the headphones need to be charged for 24 hours before use. This is done by placing them on the cradle (which, of course, needs to be plugged into a power source). A red light will appear. I then plug the wire from the cradle into the phone outlet on my receiver. I turn on the receiver and the on switch on the headphones. Additionally, the headphones need to be tuned by moving the tune dial on the headphones (as one would tune a radio dial to get a station). I recharge the headphones on the cradle every night, follow the above procedure, and they work beautifully.
[ GARY  Apr 04, 2019 ]
Try turning the little thumb wheel at the bottom of the right ear cup. If that doesn't work, return them for another pair.
[ Richard  Apr 03, 2019 ]
Since you have new batteries we can move on to other possibilities . Easiest first. Have you tried to adjust tuning dial on headset? Also, if you have a new TV it may not have analogue sound capability which is required for the Sennheiser HDR 120. Check your TV settings to make sure. If not, you will need a digital to analogue converter. Also be sure that cable connections in back of the 120 are plugged in securely. Mine we very snug and difficult to get good connection.
[ Chris  Apr 03, 2019 ]
Make sure the sound is turned up sufficiently from the device that the transmitter is plugged into. Tune the headphones with the tuning dial so that they are receiving sound from the transmitter. It is like tuning into an old style transistor radio. Make sure the volume is turned up sufficiently on the headphones themselves. Hope this helps.
[ Cory  Apr 03, 2019 ]
Is your charging stand connected to the correct sound output. We have ATT and the charging station has to the connected to their equipment not to the TV. I have also noticed if the batteries are not pushed in all the way then we have no sound.
[ Carol  Apr 03, 2019 ]
Where can I get new foam ear piece covers?
[ peg  Sep 24, 2017 ]
1 answer
Thanks for your question. Crutchfield does not have the replacement covers. You can contact Sennheiser directly. Their Customer Support number is 860-434-9190 . Hope this helps.
[ Kenny  Sep 25, 2017 ]  Staff
RS 120 come with base chargeer?
[ Jonell  Mar 16, 2017 ]
1 answer
Thanks for your question. I'm sorry, no, there is no base included. On the main product page you can see what's in the box which is HDR-120 Wireless on-the-ear headset and 2 "AAA" Ni-MH rechargeable batteries (1.2V/600 mAh). For the base to be included you would have to purchase the RS 135-9 at the link below, hope this helps.
[ Kenny  Mar 17, 2017 ]  Staff
my headset just stop working can they be repaired?
[ James  Mar 05, 2017 ]
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can help troubleshoot the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center:
[ Kenny  Mar 06, 2017 ]  Staff

Loading articles...

Compare the sound