Skip Navigation

Cobra SPX 7800BT

Smartphone-compatible radar detector

13 Reviews | 3 questions - 15 answers

Item # 079SPX78BT

This item is no longer available.

Shop all Radar Detectors


Our take on the Cobra SPX 7800BT

Cobra's SPX 7800BT radar detector won't lead you blindly into risky situations. You can count on its incredible range and super-fast circuitry to deliver up-to-the-second alerts for all incoming threats. You'll get 15-band protection against radar, laser, and other potential issues, including nearby safety alerts and emergency vehicles with strobe lights activated. The detector's chassis might be small, but you'll have a generous 1.25" color OLED screen showing you what's ahead so you can react with confidence.

Exceptional performance by itself

Cobra's SPX 7800BT radar detector won't lead you blindly into risky situations. You can count on its incredible range and super-fast circuitry to deliver up-to-the-second alerts for all incoming threats. You'll get 15-band protection against radar, laser, and other potential issues, including nearby safety alerts and emergency vehicles with strobe lights activated. The detector's chassis might be small, but you'll have a generous 1.25" color OLED screen showing you what's ahead so you can react with confidence.

The audio signals will come in loud and clear through the detector's built-in speaker, and you'll hear escalating alerts as you approach the source of the signal. You can adjust sensitivity for city or highway travel to reduce false alarms.

Add your smartphone for extra assurance

Built-in Bluetooth® wireless connectivity allows the SPX 7800BT to communicate with your iPhone® or Android™ phone. Just download the free Cobra iRadar app from Google Play or the iTunes® App Store — the detector links to the app through your smartphone's Bluetooth. You can then view all alerts and functions on your smartphone's display or on the detector's color screen, including signal strength, settings adjustment, and alert history. You'll also have warnings for verified speed and red-light camera enforcement locations across the United States, courtesy of Cobra's AURA camera database. The app offers a speedometer and compass to help you keep track of your velocity and bearings when connected to the detector.

Note: In-app purchases may be required to take advantage of some of the free iRadar app's offerings, including the AURA camera database. 

Tap into the Cobra iRadar Community

Millions of other drivers are using the iRadar app on their smartphone as they travel, so why not use their information to help yourself? iRadar users can tag detected radar signals or enforcement areas on their own phones, and those locations are uploaded to Cobra's central server. Your app then can incorporate those tagged locations into its own maps and give you a heads-up when you're approaching them.

Leave your smartphone in your pocket

You can view all the great features of the iRadar app on the SPX 7800BT's color OLED screen, so you won't have to worry about mounting your phone in a convenient location before you hit the road. You can customize color themes and take advantage of the detector's dim mode to save your eyes when driving at night.

Invisible to most radar detector detectors

The SPX 7800BT offers complete immunity to VG-2 and Spectre I radar detector detection devices, warning you when they're in proximity. You can follow the digital strength signal meter to learn how close you are to the signal's source, and what kind of threat you're facing.

More benefits of the Cobra iRadar app

You can have the app remember where you parked your car so you can find it after you've spent time at a big shopping mall, amusement park, or sporting event. And select A/V receivers from JVC will allow you to see the display of the iRadar app on the receiver's screen when the receiver's in "App Link Mode."

Sorry, but we cannot ship radar detectors to Virginia or the District of Columbia.

Product Highlights:

  • radar detector with Bluetooth connectivity
  • suction-cup mount windshield bracket kit and hook-and-loop fastener
  • straight power cord
  • 1.25" color OLED graphic display and headphone jack
  • detects 7 radar bands, 6 laser bands, 2 safety bands (including strobe alerts)
  • voice and audio tone alerts for radar, laser, and POP
  • 4 city modes
  • 360° laser protection
  • VG-2 and Spectre I immunity and alerts
  • Spectre IV+ alerts
  • display includes signal strength meter
  • dim/dark and auto-mute modes
  • IntelliMute suppresses audible alerts based on engine RPM
  • car battery low-voltage warning
  • Cobra iRadar app
    • available free through Google Play or iTunes App Store (in-app purchase required for some features)
    • connects to SPX 7800BT detector via Bluetooth
    • provides warnings for speed and red-light cameras through Cobra's AURA database
    • car finder
    • speedometer and compass

What's in the Box:

  • Radar detector
  • Windshield mounting bracket with two suction cups
  • 69" Straight power cord with cigarette lighter adapter and USB charging port
  • Self-adhesive hook-and-loop pad
  • Operating Instructions
  • Product registration card

Cobra SPX 7800BT Reviews

Average Customer Review(s):

(13 Reviews)

Cobra SPX 7800BT

Anonymous from Medford, NY on 9/2/2016

Crutchfield Customer Review (What's this?)

I just received this product. Spent 1.5 hours trying to set it up between my Company Android phone and my personal Microsoft phone. I was able to sync it once with the Android phone . Unless the phone is sync'd , the compass and speed is not displayed. I have no time to sit and play with this thing every morning . Loved my previous Cobra. I don't mind driving in circles around a parking lot to set up the compass, or updating the traffic cameras spots through my computer. At least it worked when I turned it on. I thought it was dangerous to be looking at your phone while driving. Returning to Crutchfield ASAP.

Pros: Like the size and design .

Cons: compass and camera locations total slave to phone . Not Microsoft phone compatible.

I won't buy Cobra again

Ric from Suwanee, GA on 6/6/2016

Had many of the same issues as MK reported. Just about every newer model Audi sets it off as well. I get constant RR railroad warnings when there's none around, even going over a long bridge into Florida. Every security system at a Walgreen's or CVS sets it off. Yet I can watch an officer point his radar gun right at me and it doesn't detect laser or radar in the area. So many other issues. It's gotten to the point I either leave it off or just ignore it. I've had it for almost two years and it just keeps getting worse. I'll never buy Cobra again if this is their future line of products.

Pros: It does connect well to Bluetooth every time.

Cons: See above.

Cobra SPX 7800BT

MK from Denver, CO on 5/30/2016

Crutchfield Customer Review (What's this?)

I bought the unit and took it on a 3000 mile road trip. It did a great job of telling me about every roadside store with an automatic door opener. I passed 11 police cars on the first day (including sitting on side of road and driving other way) without a sound out of it. It did also tend to go off every time I count up to a semi truck ( 100s of times) on I80. I finally turned it off and put it away after constant beeping for no reason. Later in the trip I put it in city mode while on the highway which seemed to quiet most of the semi truck warnings. It did find two state trooper police cars. It also found about 30 nonexistent police cars. In general it made so many warnings that it did not help at all. I also used the web interface which was not much help on the open highway. There were no warnings about any of the police I passed.

Pros: Found 2 of 13 police I passed while I had it on

Cons: Always giving warnings which leaves you wondering what is real

Crutchfield response on 5/31/2016 Once we saw this review, our Tech Support team reached out to help the customer. We'll either help him get the radar detector working the way it should, or help him return it for an exchange or refund.

Paid for itself 10 fold

Gilbert H. from Grand Prairie, TX on 5/28/2016

Crutchfield Customer Review (What's this?)

Traveled 3,400 miles in a G37XS and am proud to say without a ticket thanks to this detector. It paid for itself before the first fill up. I was tagged by a laser detector and darted between two trucks. The person behind me got the ticket. I found with laser, it is instantaneous. so even with detector, there is some luck involved. Radar; K and Ka have several false alerts but if you watch the scale, I was saved from several tickets. Overall, for the price I think this is a great deal, I ran through my phone and the app which helped a lot. I can honestly say, a radar detector won't save you if you still aren't alert. I had a great co-pilot to help the learning curve

Pros: Price! The app shows a community of users. Pays for itself

Cons: I say the biggest con is; I haven't figured out how to stop or pause the app. It will continue to give you responses even if detector is off.

Great product!!

Bradie from Hessmer, LA on 3/12/2016

Crutchfield Customer Review (What's this?)

Great product!!



Cobra SPX 7800BT Love It!!!

Charlie from chanhassen, MN on 2/1/2016

Crutchfield Customer Review (What's this?)

I love that this detector has the "iRadar" capability. There is no extras to buy to get this to work. It runs of the GPS of your phone. The app is free and quite useful. When using the app with the detector, it rally cuts down on all the false signals. This detector is awesome and very user friendly! I am really satisfied.

Pros: Easy to use and easy set up! Very accurate.

Cons: None


Carl H from Pilesgrove, NJ on 12/1/2015

Crutchfield Customer Review (What's this?)

This is my third Cobra radar detector in the last 25 years & it is the best by far, with all the different settings, plus Bluetooth.

Pros: Adjust setting to cut down on false alarms, built in Bluetooth connects to smart phone, oled display, plus a price break. I have used it for about a month & it has already saved me a couple of time, warnings well in advance, also red light cameras. Really satisfied with this product.

Cons: None so far.

Cobra SPX 7800BT

Mini Culture in Community from San Juan,PR. on 9/25/2014

Crutchfield Customer Review (What's this?)

Grate product just tends to over heat and may cause internal circuit implosion as did the Cobra Vedetta SLR 650G

Pros: user friendly

Cons: over heats

Great Budget Radar Detector! Very Impressed!

Larry from Tulsa, OK on 3/21/2014

Crutchfield Customer Review (What's this?)

I was very hesitant to purchase this radar detector based on previous Cobra radars I had owned over the past 20 yrs but simply couldn't bring myself to spend more on an Escort or Bel. I had recently purchased a Whistler CR85 and was not happy with its range so I decided to go ahead and give this a try. I'm very glad that I did! I tested both units in my car at the same time (I know this is not optimal due to possible interference, but I gave it a try) and there was a drastic difference in the detecting range of these two units. The cobra picked up a number of LEO's with as much as 10 seconds more warning before my Whistler sounded. The Cobra had very good lead time. The Whistler, a number of times, gave me just enough warn time to look up and see the cop. In no way enough time to slow down or react. Luckily, my Cobra had sounded several seconds earlier to warn me of the upcoming threat. Here's my assessment of the different bands. X - Filtered very well, did not receive any false alerts. K - Extremely long range. I did pick up a few alerts where I didn't see a cop. May have been door openers or other leaky radars. KA - Here's where the Cobra really stood out against my Whistler. The Whistler has almost no range here. I would give it 0 out 5 stars. Again, just enough warning to look up and see the cop. This new Cobra gave me on average about 10-12 seconds of lead time. This is going 70-75 MPH with the cop approaching from the other direction probably around the

Pros: Very Good KA Range. Great Cobra iRadar App. Really Nice Display. Compact. GPS Interaction With Your Phone. Displays Your Speed and Heading. Great Value.

Cons: No Hard Wiring Cable. The Cobra Reputation. I Can't Think of Any Related To The Unit Itself.

Works well

Mike from up state NY on 2/4/2014

Crutchfield Customer Review (What's this?)

Works well with or without the blue tooth phone, I have found that I-cobra app. works best in a more populated area as you need others on the network.

Pros: easy to use, well built, small size. good range. App is very good for reporting.

Cons: blue tooth sometimes needs to be reset, not sure if it is my phone, Onstar in my car or the detector. you need other I-cobra user on the road to get the full advantage.

Cobra SPX 7800B

Alex from New York on 1/21/2014

Crutchfield Customer Review (What's this?)

I really like the radar. I had it for a few weeks and drove about 1k miles with it. The range seem to be very long - so you can have plenty of time to react. Cobra app seems to work well as well and let you report police cars, traps, etc. and see reports of other people. However, while driving on a highway, the radar alerted a few times (showed a few times a very strong 5 bars signal) but I had not notice any police cars around. It happened a few times - but no police. It is a little frustrating - I had no idea what signal it was picking up on a highway. I understand that a bit more caution is better than if it didn't pick up anything at all.

Pros: Long range, Cobra Application, easy to set up.

Cons: False alarms (strong signal - 5 bars) on a highway - but no police cars around

I have had this I.ounts & it works great. This is the best radar detec

Jeffrey J from New Jersey on 12/18/2013

I have had this IRadar Cobra SPX 7800BT for three mounts & it works great. I would recommend it to anyone. It works better then any Radar Detector I have ever seen out on the market. The Cobra IRadar is the way to go it works great with my I Phone and it always gives me plenty of time to get my speed down. It doesn't go off all the time like Outher Radar Detectors do only when their are Police moving or parked doing Radar & I can tell when thay are using there laser guns a long distance before I can even see him or her. It's a great product & it is cheaper then a ticket.



Love it

Mario from Tulsa, OK on 12/16/2013

Crutchfield Customer Review (What's this?)

I bought this after i got pulled over by a highway patrolman in a residential neighborhood. This thing is so convenient that it even tells you where traffic cameras are.

Pros: Convenient, Great range, awesome heads up alerts and a great ball of safety for your entire car.

Cons: None so far. Ive only had it for 3 weeks.


Hands-on research

Features and Specs

X Band Radar Yes
K Band Radar Yes
KA Photo Radar Yes
KA Wideband Radar Yes
Laser Yes
Pulse Warning Yes
VG-2 Protection Yes
Display & Alerts
Dimmer Yes
Dark Mode Yes
Visual Alerts OLED
Audible Alerts Tone+Vox
Mute Yes
Earphone Jack No
Visor Clip No
Straight Cord Yes
Coiled Cord No
Case Included No
Battery Powered No
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research


Overview: The Cobra SPX 7800BT is a high-performance radar/laser detector in an ultra compact design. With built-in Bluetooth and the free Cobra iRadar app, you can share threats from your protector, and receive location information for speed/red light/camera and speed traps. Equipped with the latest technology and military-grade components, the SPX 7800BT's powerful CPU can sweep the entire police radar band spectrum in less than 240 milliseconds, providing extended range and warning time over previous models. The SPX Series gives you the best detection range in its class against all current radar/laser speed enforcement guns used today, including Instant-on and POP mode radar.

15-Band Radar/Laser Detection: The SPX 7800BT detects 15 bands of radar and laser, including the Safety Alert System:

  • Radar:
    • X band
    • K band
    • Ka band
    • Ku band
  • Laser (360° detection):
    • LTI 20-20
    • LTI Laser
    • Kustom Signals Laser 340
    • Kustom Signals Laser
    • Stalker LIDAR
    • Laser Atlanta Speedlaser/Kustom Signals-ProLaser II
  • Safety Systems:
    • Safety Alert System
    • Strobe Alert System
  • Radar Detector Detectors:
    • VG-2
    • Spectre I
    • Spectre IV+

Organic LED Display: The SPX 7800BT is equipped with a 1.25" full color Organic LED display with bright graphics and clear text. You can adjust the intensity of the display using the top mounted "Dim" button. The detector has a Bright display mode for daytime driving, a Dim mode for dusk driving, and Dark mode where no visual alerts will be displayed. The detector also includes a Color Theme feature that allows you to customize the display screen color scheme to match your vehicle's dash illumination. You can choose from Red, Blue, Orange, White, Green, or Multi-Color.

Cobra iRadar App: Cobra iRadar is a large community-based radar/laser/camera detection system. When linked to the Cobra iRadar detector via Bluetooth Smart, users can share and receive alerts in real time from other iRadar users. The Cobra iRadar app is compatible with iPhone 4S and later, and requires iOS 6.0 or later. It is also compatible with Android smartphones running Android OS 2.3.3 or higher. Cobra iRadar provides the following features:

  • Provides alerts from and access to AURA, Cobra's exclusive and 100% verified camera and driving hazard database of red-light cameras, known speed traps, and dangerous intersections.
  • Displays live radar and laser alert information from all iRadar users.
  • Allows you to submit and receive locations of live police, red light cameras, speed cameras, and caution areas from other members of the iRadar community.
  • View alert history on the radar map view.
Note: Subscription charges are required within the iRadar app for access to the Cobra iRadar Center ($4.99/month, $13.99/quarterly, or $49.99/annually) and AURA Live ($2.99/month, $7.99/quarterly, or $29.99/annually).

Pairing: Once the Cobra iRadar App is downloaded to your smartphone and the unit powered on, the iRadar unit will appear in your phone's Bluetooth settings menu. The detector's LED will flash blue during pairing and will turn solid blue when pairing is completed.

Compass: The SPX 7800Bt features an 8-point GPS Compass to give you an accurate direction heading when connected to your iOS/Android smartphone via the Cobra iRadar App.

Instant On/Pop Mode Alert: The Pop Mode Radar Gun is a single-pulse Doppler radar that is a feature of a K and Ka (Bee III radar gun) band Instant-On radar gun. It uses a single, short-time pulse to measure the target vehicle's speed. The SPX 7800BT can sense Pop radar signals beyond the effective range of Pop radar guns, and will alert you with two beeps and two flashes of the "P" indicator. During the alert, the unit will continue to detect other signals.

Safety/Strobe Alert: The Cobra SPX 7800BT will give you advanced alert of the presence and/or approach of emergency vehicles, trains, and road hazards from systems equipped with Safety Alert Traffic Warning System transmitters. The unit also has a Strobe Alert detector that can pick up the special strobes mounted on the light bars of many emergency vehicles to change traffic signals as the vehicle approaches.

Visual Alerts: The text display includes the type of signals detected and a numeric as well as vertical bar indication of the signal strength from one bar (weakest) to five bars (strongest).

Voice or Tone Alerts: The unit will sound alerts and confirm user settings with an audible alert. You can choose either Voice or Tone alerts. In Voice Alert mode, you will first hear several tones, then a voice announcing the type of signal detected, followed by more tones.  In Tone Alert mode, only the tones will be heard. A distinctly different tone is used for each type of signal detected, and with radar bands, the tones will repeat faster as you approach the signal source.

LaserEye: The SPX 7800BT's LaserEye provides you with 360° degree detection of laser signals. When mounting the unit, you must make sure the LaserEye has a clear view to the front and rear of the vehicle.

IntelliShield: The unit has Quad-level IntelliShield false signal rejection to reduce uncertainty and frustration from multiple false alerts. When in Highway mode, the unit provides full immediate response to all signals detected. This mode should be used when driving on the interstate and major highways. When driving in more urban environments, you can select one of the City Filtering Modes (City X, City X+K, City Plus X+K+Ka, and City Max) to minimize false alerts from automatic door openers operating in the X and K-band frequencies.

VG-2/Spectre I/IV+ Protection: The SPX 7800BT will alert you when VG-2, Spectre I and IV+ radar detector detection (RDD) is in use near your vehicle. The unit is undetectable by VG-2 and Spectre I devices, but can be spotted by Spectre IV+ RDDs. During an alert, the unit continues to detect other signals. You can choose whether or not you want the unit to show VG-2 and Spectre I and IV+ alerts and whether or not to sound audible alerts.

Auto/Manual Muting: When Auto Mute is On, the unit automatically reduces the audio volume of all alerts after they have sounded for four seconds. The signals will remain muted for as long as the signal is detected. When manually muting, you must press the Mute button while a signal is being received. This will reduce the volume of the alert in progress. The volume will return to normal for the next signal.

IntelliMute: IntelliMute allows you to avoid alerts you don't need to hear because you are either stopped or moving slowly. By sensing the RPMs of the engine, IntelliMute knows that you are driving at a low speed and automatically mutes all alerts (except for strobe signals from emergency vehicles). You must first set an activation point for your engine's RPMs, and when the revs go below that point, IntelliMute begins muting. Once set, the activation point is stored in memory.

IntelliMute Pro: IntelliMute Pro prevents detection by radar detector detectors (RDDs), such as VG-2, Spectre I and Spectre IV+, when traveling at slower speeds. When IntelliMute Pro is on, and engine RPMs are below the IntelliMute Pro's activation point, the detector's radar detection circuits are turned off to prevent detection by RDDs. In addition, no alerts will be given at RPMs below the activation point.

Mounting: You will get optimum performance from the detector if you mount it at a point approximately in the center of the vehicle, as low as possible on the front windshield without obstructing the view of the road to the front or rear. The detector can be mounted in two ways:

  • Dashboard Mount: Using the supplied hook-and-loop pad, you can attach the detector to the dashboard.
  • Windshield Mount: The supplied windshield mount adheres the detector to the windshield with two suction cups. The angle can be adjusted for best visibility.

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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

The smart phone app connection and voice alerts [ Fred  Jul 31, 2016 ]
Have a older Cobra but the Free shipping & the Discount , to Good to pass up. Thanks Tommy B. [ E  Apr 30, 2016 ]
Needed it [ B  Feb 15, 2016 ]
Price/value, features [ shana  Dec 10, 2015 ]

3 questions already asked

Yes. That is what I use and it works great. [ Robert  Jun 11, 2016 ]
Yes works great with my 6 plus [ Chlo  Jun 06, 2016 ]
Yes I have iPhone 6 works great! Definitely worth every penny!! Synced with the app it's accuracy can't be beat [ THOMAS  Jun 06, 2016 ]
Yes. [ Mathew  Jun 06, 2016 ]
No. Only the current speed of the car if connected via Bluetooth with your phone.... [ Luci  Nov 13, 2015 ]
No it just displays detector info and your car battery volts which I like and overall I love it [ Richard  Nov 12, 2015 ]
It does if you have the app on with location turned on and your phone connected to the radar through Bluetooth. If the app is not connected to the radar it only shows your battery voltage and functions as a basic radar. [ Mario  Nov 12, 2015 ]
No, it displays your current speed on screen. You can, however, set a speed maximum on the app that will alert you whenever you go above it [ SARA  Nov 12, 2015 ]
No. It only registers YOUR current speed. [ Ric  Nov 12, 2015 ]
When it's Bluetooth with your smartphone. [ James  Nov 12, 2015 ]
Yes and accurate [ MIKE  Nov 12, 2015 ]
Radar jammers are illegal under FCC rules as it a radio wave. The Cobra does not use this technology. You may be confusing it with Laser jammers which use IF light from LED arrays to jammer the laser gun. Those are legal in 40 states and not regulated by the FCC. Cobra uses no jammer technology at all. [ mikem  Nov 24, 2014 ]
Understanding that "jammers" are illegal, does this unit use this technology? [ MissBliss  May 04, 2014 ]
Hi Rich, The alarms will not delivered through the vehicles speaker system after it is paired with your phone. The alarms are still coming from the detector. Hope this helps. Franz [ FRANZ  Jan 08, 2014 ]
I am using detector with iOS.My iPhone is paired with car and it cannot be heard thru car.The speaker on the unit is pretty loud and works great.The App is great also.I love this unit. It was a great buy. [ James  Jan 08, 2014 ]