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Item Code: XRS9840
Warranty: 2 YEAR

The Cobra XRS-9840 radar detector has extreme advantages over any other radar at this price.  It has a bright easy to read display and easy to use menu options. 

One of the really cool functions of this model is that it has a car battery voltage display.  This feature is great if you have a high powered audio or video system in your car, and it is also just generally good to know if your battery voltage is too low or too high, so you can avoid electrical problems.  In fact the radar will actually automatically alert the driver if your battery falls below 11.9 volts.  Any car battery should be running at approximately 12 volts.

The display is bright, and is easy to read during day or night.  Please note you do not need to stare at the display, because it will make a loud beeping noise when it senses a radar or laser signal.

The settings are so easy to set, and extremely user friendly because of nice display.  On other radar detector models, this is usually one of the biggest complaints. 

Another cool feature we noticed on this model, is that the radar detector can detect your speed and automatically mute the radar sound.  this is an optional setting. 

Most importantly, this radar detector has a 360 degrees coverage and it responds to all types of signals police use to detect the speed of a vehicle.  It will detect radar, and laser signals.  This model also has an increased range of detection and provides advanced warnings.  There is a built in 8 point digital compass, which is an incredible feature.


  • Windshield mounting bracket
  • Coiled Power Cord (hooks up to cigarette lighter plug)
  • Hook and Loop Fasteners (mounting brackets)
  • Owners Manual
  • Warranty


  • Ultra Performance: Extra detection range provides advanced warning.
  • 12-Band Detection: Detects 6 radar, 4 laser and 2 safety signals
  • Radar signals: X Band, K Band, Ka Superwide, Ku Band, VG-2 and Spectre. Laser signals include LTI 20-20, Ultra Lyte, ProLaser and ProLaser III
  • Bright Blue ExtremeBright DataGrafix™ Display (Copyrighted Technology by the manufacturer):: Provides enhanced data display in easy-to-read bright blue digital grraphics
  • POP Mode Radar Gun Detection: Detects the latest POP Mode Radar Gun (Super-fast Instant-On Mode)
  • Ku Band Detection: Detects Ku Band Radar Gun
  • LaserEye (Copyrighted technology by the manufacturer): Provides 360-degree detection of laser signals.
  • Voice Alert technology (More copyrighted technology you will only find from Cobra): Warns driver with specific voice annunciation of the signal being detected.
  • Spectre Alert™/Undetectable
  • Strobe Alert®: A Cobra exclusive, Warns user when it detects tens of thousands of emergency vehicles currently equipped with traffic light controlling strobe emitters. Provides advance warning of the presence and/or approach of emergency vehicles.
  • Safety Alert (copyrighted technology by the manufacturer)  : Warns drivers of the presence and/or approaching emergency vehicles, railroad crossing, and road hazard locations.
  • Auto Mute: Automatically mutes the alert tone for enhanced driver convenience
  • IntelliMute®: Relative-speed-sensing Auto Mute system that virtually eliminates false alerts
  • Digital Signal Strength Meter
  • Car Battery Voltage Display
  • City/Highway Modes
  • EasySet® Programming Menu: User-friendly!  Easy to set and program with easy to read and easy to use menu options
  • Stay Set Electronic Memory: Electronically remembers radar detector settings for an indefinite period of time even with the power removed.
  • Low Car Battery Warning: Alerts user whenever battery voltage falls below 11.9 volts.
  • 8-Point Electronic Compass: Automatically provides an accurate electronic direction reading.
  • 360 degrees Protection against all types of Laser, and Radar
  • New KU Band Support
  • Extremebright Datagrafix Display
  • Extremely bright with vivid colors
  • VG-2 Undetectable
  • VG-2 Alert
  • Battery voltage indicator
  • Low battery voltage auto alert
  • Spectre I Undetectable
  • Spectre I Alert
  • Instant-On (Pulse) Detection
  • Detects POP Mode
  • Select Between Voice or Tone Alerts
  • Detailed Safety Alert® and Strobe Alert Messages
  • 8-point Digital Compass
  • New DataGrafix Display (copyrighted technology by the manufacturer)
  • Signal Strength Indicator
  • Brightness settings (you can dim and brighten the display through the settings menu)
  • IntelliMute (copyrighted technology by the manufacturer)
  • Auto and Manual Muting
  • EasySet Programming Menu (copyrighted technology by the manufacturer)
  • SmartPower Power Saver System (copyrighted technology by the manufacturer)
  • Stay Set Electronic Memory
  • 3 Levels of City Mode plus Highway Mode
  • Audio Jack
  • Electronically remembers settings after it is turned off and on again
  • Visual Only Mode
  • Audio Only Mode
  • 3 Level Dim Button
  • Volume Control
  • Low voltage battery indicator warning

Product Specifications

Manufacturer COBRA
Warranty 2 YEAR
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