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Cobra SPX 5400

Radar detector

Item #: 079SPX5400

In Stock

5 Reviews | 1 question - 3 answers

Your price: $119.99 Earn up to 120 Rewards points

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Hear what's happening

The SPX 5400 radar detector packs much of Cobra's most advanced technology into one road-ready guide. It'll lock on to multiple safety, laser, and radar bands, and you'll see what's coming instantly on the detector's UltraBright Data Display™. Even better, the detector's voice alerts give you an audible layer of protection. You'll instantly hear what kind of signal is being detected so you can make an informed decision. Add in 360-degree laser coverage and alerts for POP instant-on radar, and you can travel with confidence knowing that you'll avoid any unpleasant surprises.

Virtual camouflage for your ride

Stealth is key when you don't want others to know you've got a radar detector. The SPX 5400 provides complete immunity to Spectre I and VG-2 radar detector detection devices, giving you a heads-up when they're nearby. Its rugged, compact chassis protects super-fast circuitry that alerts you to upcoming problems well in advance. You can follow the 5-level digital strength signal meter to learn how close you are to the signal's source.

Convenient extras

Choose between city and highway modes to keep false alerts to a minimum. Want to keep things quiet? The IntelliMute® feature reduces false alerts based on your relative speed, and keeps your detector free from detection. Turn on the dim mode and give your eyes a break when driving at night.

Product Highlights:

  • radar detector
  • suction-cup mount windshield bracket kit
  • coiled power cord
  • UltraBright Data Display and headphone jack
  • detects 7 radar bands, 6 laser bands, 1 safety band
  • digital voice and audio tone alerts for radar, laser, and POP
  • city/highway modes
  • 360° laser protection
  • VG-2 and Spectre I immunity and alerts
  • display includes signal strength meter
  • dim and auto-mute/intelligent-mute modes

Cobra SPX 5400 Reviews

Average Customer Review:

5 Reviews

cobra spx 5400

Written by: R.D from Texas on December 16, 2015

goes off when cops are right in front of warning at all and sometimes it wont give you any alerts at all I'm not very confident in it I would save a few bucks more to buy something better

Pros: price

Cons: not confident in it

Crutchfield response on December 22, 2015 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

cobra spx 5400

Written by: Jerry from Puerto Rico on July 6, 2014

Crutchfield Customer Review (What's this?)

Bang for your Buck.... not bad.... work pretty well is not a Passport or a Valentines but so far so good will save you from a Ticket

Pros: Excellent Price

Cons: is not as sensitive as a passport or Bell in distance but work well

Works most of the time

Written by: Aaron from Staples Minnesota on May 10, 2014

Crutchfield Customer Review (What's this?)

It works most of the time. I don't know if they don't have there radars on or not but I pass 4 sheriffs and it didn't pick any of them... But it did pay for its self right away...for 100dollars you can't really go wrong

Pros: Cheap

Cons: Not very confident in it

Cobra SPX 5400

Written by: Dennis from Louisville, KY on April 8, 2014

Crutchfield Customer Review (What's this?)

Like how the audible alert sound out then tails off slowly.



Cobra spx5700

Written by: Alberto from Sunnyvale California on November 22, 2013

Product is very good saves me a couple tickets

Pros: Voice alert

Cons: Coiled wire gets annoying

Hands-on research

What's in the box?

Download owner's manual

  • Radar detector
  • Windshield mounting bracket with two suction cups
  • Coiled power cord (18" to approximately 60" length) with cigarette lighter adapter
  • Self-adhesive hook-and-loop pad
  • Operating Instructions
  • Product registration card

Features and Specs

X Band Radar Yes
K Band Radar Yes
KA Photo Radar Yes
KA Wideband Radar Yes
Laser 360 Degree
Pulse Warning Yes
VG-2 Protection Yes
Display & Alerts
Dimmer Yes
Dark Mode Yes
Visual Alerts Data
Audible Alerts Vox/Tone
Mute Yes
Earphone Jack Yes
Visor Clip No
Straight Cord No
Coiled Cord Yes
Case Included No
Battery Powered No
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research


14-Band Radar/Laser Detection: The Cobra SPX 5400 detects 14 bands of radar and laser, including the Safety Alert System:

  • Radar: (Visual Display--Band + Signal Strength)
    • X band
    • K band
    • Ka band
    • Ku band
    • Pop Radar
  • Laser: (Visual Display--"L" is steady)
    • LTI 20-20
    • LTI Laser
    • Kustom Signals Laser 340
    • Kustom Signals Laser
    • Stalker LIDAR
    • Laser Atlanta Speedlaser/Kustom Signals-ProLaser II
  • Safety Alert Traffic Warning System: (Visual Display--"S" is steady)
    • Emergency Vehicles, Road Hazards, Trains
  • VG-2 and Spectre I or IV+ (Radar Detector Detectors): (Visual Display--see below)
    • Interceptor VG-2 (V is steady)
    • Spectre I or IV+ (V blinks)

XRS Technology: The SPX 5400 is equipped with Xtreme Range Superheterodyne Technology, with super-fast lock-on detection circuitry, to provide extra detection range, and the best possible advance warning to even the fastest radar guns.

UltraBright Data Display: The SPX 5400 is equipped with the UltraBright Data Display, an easy-to-read display that provides easy recognition of the band detected by using band identification icons. You can adjust the intensity of the display using the top mounted "Dim" button. The detector has a Bright display mode for daytime driving, Dim for dusk driving, and Dark where no visual alerts will be displayed.

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 5400 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 Alert: The Cobra SPX 5400 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.

Visual Alerts: The display includes the type of signals detected and a numeric indication of the signal strength from 1 (weakest) to 5 (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 top-mounted LaserEye provides you with 360° degree detection of laser signals. When mounting the unit, you much make sure the LaserEye has a clear view to the front and rear of the vehicle.

VG-2/Spectre I/IV+ Protection: The SPX 5400 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.

External Speaker Jack: You can connect an external speaker or earphone if the detector is to be used in an environment with high ambient noise levels. A 2.5mm sub-mini jack is provided.

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.

Customer Q&A

Crutchfield asked  
Why did you buy this?

Good reputation [ angel  Feb 09, 2016 ]

1 question already asked

If it's a clear shot and their gun is pointing at you.... miles... If they are driving toward you and the gun is pointing off to the side then the detector won't go off until you get near them, but that means they aren't clocking you anyway. Keep in mind that a curvy road and trees all affect the reception, and some areas have instant-on radar guns so you won't get any warning. I've had my detector for about a year and it has worked quite well for me. It has a lot of false POP alerts (banks and such), but I don't want to turn that feature off. [ Scott  Sep 04, 2015 ]
Depending on your speed, I have found that it has picked up radar up to a mile away. Again, your speed will make all the difference on how it helps you. [ JAMES  Sep 03, 2015 ]
around 1 mile [ DAVE  Sep 03, 2015 ]

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