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The Best in Radar Detection and Laser Protection Systems.
K40 guarantees your satisfaction, 100%!
K40 continues to offer the best guarantee in the industry, as it has since 1981. It’s a confidence that comes from three decades of designing the very best automotive radar and laser protection systems in the world.

Along with the industry’s only speeding ticket guarantee, your K40 guarantee also includes:

  • 100% performance guarantee – If your K40 RL Series radar detector does not outperform any other radar detector you’ve owned, return it within 30 days for a full product credit.
  • 100% one-year quality guarantee – K40 will repair or replace any defective RL series radar detector for one full year from date of purchase.
  • 100% theft guarantee – If your K40 RL series radar detector is ever stolen, we’ll replace it.

The New K40 Laser Defuser g5 emits a powerful infrared light signal back to the police laser gun at a pulse rate it cannot understand. This enables the driver to avoid detection and ultimately a speeding ticket. The new Laser Defuser g5 interface module allows up to three additional laser defusing transponders that mount on separate sides of the vehicle, front or rear, for maximum coverage and performance. It’s all the protection you’ll ever need.


  • New - 5 Custom IR laser reception diodes per laser transponder for enhanced laser gun detection.
  • New - 10 more powerful laser defusing diodes in EACH Defuser g5 transponder.
  • New - Fly Eye Lens. A lens composed of an array of smaller lenses designed to provide increased off axis signal capture.
  • New - Sync Interface. The sync feature fires up to 4 Defuser g5 transponders simultaneously emitting more jamming output to the laser gun than ever before.
  • New - 3 User Selectable Transmit Modes.
  • Constant Transmit: The Defuser g5 will continually transmit a jamming signal for the duration of the laser encounter.
  • Pulse Transmit: The Defuser g5 will transmit a jamming signal for 10 seconds giving the driver time to reduce speed, while allowing the officer to obtain a speed reading and eliminate suspicion of "jamming".
  • Receive Only Mode: For notification only, no jamming signal will be emitted.
  • Laser Alert - Provides warning of police laser targeting with a unique audible and visual alert, giving the driver the time needed to react and safely reduce speed.
  • Remote Compatible - Laser Defuser g5 is uniquely designed to integrate with any K40 Remote Radar System, allowing the user to utilize one warning display for both radar and laser alerts.
  • License Plate Mount- Strategically positions Defuser g5 right where police laser gun operators are trained to target, while providing a stealth, OEM appearance for the system.
  • Durable ABS Housing - Made from one of the strongest synthetics available, the specially designed frame helps protect the microelectronics from both the outside weather elements and everyday wear.
  • Modular Design - Versatile design allows the unit to be removed from the standard frame and custom mounted elsewhere on the vehicle with the included Universal Mounting Bracket. Perfect for installations on vehicles that are not required by law to have a front license plate.
  • Auto wake-up sequence - Whenever the vehicle is turned on, an automatic wake up sequence verifies the unit is operating properly and monitoring the road ahead.

Don't forget to ask us about professional installation!

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