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K40 Laser Defuser

Complete laser jammer defense against police laser speeding tickets

How does police laser (LIDAR) work?

If a police laser (LIDAR) gun is used to target your vehicle with pulsed bursts of infrared light traveling at 186,000 miles per second, it takes just 0.3 seconds to get a speed lock on your vehicle.  A police laser gun beam operates like a flashlight beam – the closer it gets to the target, the smaller it becomes.  At the typical targeting distance of 1000 feet, the police laser beam hitting your vehicle is 30 inches in diameter. At 500 feet, the police laser beam is reduced to only 15 inches in diameter!

How does the K40 laser Defuser work?

The K40 Laser Defuser combats the pinpoint accurate firepower of police laser guns with advanced countermeasure technology. Our high-performance and reliable laser jammers receive the police laser gun’s infrared light beam, analyze it, and then send back a jamming signal. This active defense happens in milliseconds to give you time to safely reduce speed to avoid a speeding ticket.

Laser jammers can only jam a police laser gun signal they detect. How many laser Defusers you need will depend on several factors to be determined by you and your installing K40 Dealer, like:

  • The available mounting locations on your vehicle – do you drive with a front license plate, do you have a chrome grill, how far apart are your headlights?
  • Your driving habits – are you an accidental speeder or a real driving enthusiast?
  • Where you drive –  do you drive primarily in an urban environment, the country, or are you a high mileage interstate traveler?
  • The size of your vehicle – do you drive a compact sport vehicle or a large pick-up truck or SUV?

Depending on the answers to these questions and more, you may need two to five Laser Defusers installed on your vehicle for ticket-free guaranteed combat readiness.

Talk to a real expert. A senior K40 product consultant answers every call, 24/7/365.
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K40 introduced the world’s first laser jammer countermeasure to police laser guns  in 1994,  Since then, K40 Electronics has evolved the high-performance Laser Defuser line with industry-leading innovations, capable of combating police laser guns including variable pulse rate guns.

Radar System Compatibility – All K40 Laser Defusers integrate with any K40 remote radar system, thereby utilizing a single warning display (instrument-mounted LED(s) for both police radar and police laser alerts.

Laser Defuser Optix  


Each Laser Defuser Optix transponder contains a powerful Nanostack™ technology pulsed laser diode for high optical laser jamming output power and outstanding reliability.

  • Ultra-Compact Footprint for Discreet Placement
    The laser Defuser Optix has a compact footprint which allows for a custom and discreet installation into grilles and other tight spaces.
  • Updatable to Ensure Optimum Performance
    The interface controller features a USB port so its system software can be updated as new police LIDAR technology emerges.
  • Maximum Coverage Protection
    The in-vehicle sync interface can fire up to five transponders simultaneously for superior detection and maximum laser jamming output to combat the latest VPR LIDAR guns.

Three User-Selectable Transmit Modes

  • Constant Transmit: For as long as it’s receiving a police laser gun signal, the Laser Defuser Optix transponder will continuously transmit back to the gun.
  • Pulse Transmit: Upon receiving a police laser gun signal, the Laser Defuser Optix transponder will transmit back to the gun for up to five seconds. The system will then shut off for 30 seconds. This allows for the reduction of speed while also eliminating the suspicion of “jamming” where the use of laser jammers is prohibited.
  • Receive Only: For notification only. No signal will be transmitted.


Laser Defuser Optix – Specifications
  • Operating Wavelength – 905 nanometers
  • Power Requirements – 11.5 – 16.0 Volts DC negative ground
  • Diode Type – Pulsed Nanostack™ technology laser with epitaxially stacked emitters
  • Transponder Dimensions – 2.2″ L x .54″ H x 1.1″ D
  • Sync Interface Dimensions – 3.5″ L x 1.0″ H x 1.9″ D
  • Operating Temperature – -40° to +165° Fahrenheit
  • Laser Class – Class 1 laser product (eye safe), compliant with Laser Product Performance Standards: US FDA 21 CFR, Part 1, Sub J, 1040.10 &11


  • What Is The K40 Consult?

  • Three K40 Laser Defuser Optix vs DragonEye Compact

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  • K40 Laser Defuser Optix Combats DragonEye in Pulse Transmit Mode

  • K40 Laser Defuser Optix vs Stalker XLR VPR

  • K40 Laser Defuser Optix vs Stalker XLR VPR - 2

  • K40 Laser Defuser Optix vs Laser Ally VPR

  • K40 Laser Defuser Optix vs UltraLyte LRB

Technabob K40 RL360i & Defuser Optix Review

“…on the open road when I got an alert, it was from an actual police car. In each case, I had at least a mile to slow down…the K40 system is the best I’ve ever experienced…” Read more

LaserJammerTests K40 Laser Defuser Optix Review

“The data speaks for itself…(Jam To Gun on all test runs)…I definitely stand behind the jammer…” Read More


K40 Laser Defuser g5 Review – Lab style and road tests. Results: As Advertised!

January 2014 Review.  A little history before getting to the fun stuff.

Another generation of the well known Defuser brand has made it to the market.  Since 1996, K40 has been developing infrared speed detection inhibiting ‘plate frames.’  The jamming techniques have changed over the years(Brute/white noise to pulse match), but the customer service has…Read more

I don’t know what was up today but I must have been lasered ten times by NJ State Troopers in my 100 mile journey today. Not one of them came after me.

E. D. Speer

Safety Information

If your vehicle has any of these radar based options:

  • Active Blind Side Assist
  • Attention Assist
  • Automatic Cruise Control
  • Blind Side Assist
  • Blind Spot Information System
  • Blind Spot Intervention (BSI)
  • Blind Spot Warning (BSW)
  • Blind Zone Assist
  • Brake Assist
  • Collision Avoidance System
  • Cruise Control with Stop and Go
  • Distronics Plus
  • Driver Assistance Package
  • Emergency Braking System
  • Lane Change Assist
  • Lane Departure Warning
  • Park Assist
  • Presafe

You need a radar detector and laser jamming solution that protects you from speeding tickets WITHOUT compromising these important safety features. Your K40 Consultant will customize and tailor the perfect solution, so that you no longer have to choose between OEM options and the confidence to drive your performance automobile. Call 800.323.5608 and speak directly and immediately to a K40 Consultant. Find your nearest authorized K40 dealer.

LIDAR stands for “light detection and ranging.” A LIDAR/LASER gun transmits a pulsed rate of light at an object, the object reflects the pulsed light, and the instrument analyzes the speed of the reflection. Through this analysis, the speed and distance of the object can be determined. At typical target ranges of 800-1000 feet, a police laser gun beam measures between 18″ and 36″ in diameter. This narrow, infrared, monochromatic, one milliradian laser emission does not scatter like a police radar signal, so there is no advance warning to police laser use.

Unlike radar, laser guns give no advance warning. If you are targeted while speeding and you do not have a Laser Defuser (jammer), you will receive a speeding ticket. Laser is very short-range. Laser gun ranges vary from approximately 800-2000 feet. An officer cannot be moving/driving while shooting laser, and laser cannot read through glass. Laser can target and acquire a speed on a specific vehicle in a pack of cars. Radar is a radio frequency that leaves the gun and spreads out over a great distance. This is why radar detectors can pick up police radar from distances up to 10 miles away. Officers can drive and obtain radar speed readings on vehicles while they are in motion.

Both Laser Defuser models detect the laser light signal transmitted by a police laser gun and notify drivers with a unique audible and visual alert hidden discreetly inside the vehicle’s interior. Simultaneously, the Laser Defusers transmit a return infrared light beam at the same frequency as police laser so the police laser gun cannot get a speed reading. The main difference between the two models is the Laser Defuser g5 uses 10 LED jamming diodes whereas the Laser Defuser Optix uses a single pulsed laser diode.

Laser guns are capable of measuring a vehicle’s speed in less than one second. By the time a laser detector alarms, it is already too late. Only laser jamming countermeasures like Laser Defusers can provide drivers with the time needed to react and safely reduce their speed to avoid a costly ticket.

Yes. The Laser Defuser systems are designed to detect and deactivate police laser signals only. Therefore, we recommend complementing a Laser Defuser g5 or Laser Defuser Optix system with any K40 Electronics portable/window mount or custom-installed radar detector to create a complete police radar and laser countermeasure solution.

Yes. The Laser Defuser g5 and Laser Defuser Optix have been designed to allow integration with preexisting K40 remote radar detection systems. This integration eliminates installing an extra warning light or speaker to receive alerts from the Laser Defusers.

K40 recommends two Laser Defusers be installed on the front of every vehicle. For optimum placement for your specific vehicle, you should consult with your installing dealer and/or call us at 800-323-5608. The Laser Defuser g5 comes pre-installed in a license plate frame for a factory looking rear laser protection solution. In all mounting locations, front or rear, Laser Defusers should be mounted parallel to the ground (not pointing up, down, or to the side) with a clear, unobstructed view of the road for maximum effectiveness.

Since the Laser Defusers emit an infrared light beam that does not interfere with radio waves or any devices regulated by the Federal Communications Commission (FCC), there are no federal laws banning the use of laser jammers. Some states do restrict the use of laser jammers, so K40 recommends checking your state statutes for specific information.

We have absolute confidence in the performance of our products, and you should never get a speeding ticket when they are operating and used properly. In the rare event you should receive a speeding ticket in the first 12 months of ownership, we’ll pay any and all fines (excludes attorney fees and/or insurance premium increases as well as tickets issued in school zones, construction zones, and/or when DUI or DWI is involved). No questions asked.

It’s the best, most comprehensive guarantee in the business, and we make it with the utmost confidence.




Drive Ticket Free Guaranteed

Drive Ticket Free

Get a ticket during the first year of ownership, we pay for it, subject to the terms and conditions below. Simply send us a copy of the radar or laser speeding ticket, your proof of payment of the ticket, and your receipt for your K40 purchase.

We started offering this guarantee in 1985 and we still stand by it today!

Note: When applying for speeding ticket reimbursement, you must send a copy of your proof of purchase (a dated sales receipt) for your K40 Radar / Laser Detector, a copy (not the original) of the speeding ticket, and proof of ticket payment – copy of cancelled check (both sides), money order, or court receipt. All information provided to K40 will remain confidential.

100% Ownership Guarantee

  • 100% Performance Guarantee – If your K40 Radar Detector or Laser Defuser does not outperform any other radar or laser protection system 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 product for one full year from date of purchase.
  • 100% Theft Guarantee – If your custom installed remote radar detector is ever stolen, we’ll replace it.

To ensure you’re covered by all K40 guarantees, register your product today.


Terms and Conditions

  • Ticket-Free Guarantee not valid for tickets issued in school or construction zones, incurred with a DUI or DWI violation, or for tickets received outside the U.S. and Canada.
  • All K40 Electronics products carry a one year “repair or replace” Limited Warranty. This coverage begins on date of purchase and applies to defects in product materials and workmanship only. Installation, removal, or misuse is not covered.
  • In Canada – RD950 and RLS2 portable models only –  Excludes any photo radar/laser and/or any tickets issued that do not accumulate demerit points.
  • Installed radar detector systems must include the purchase of at least one Laser Defuser in order to be covered for any laser speeding ticket reimbursement.
  • Theft claim must include complete copy of police report indicating details of loss to due theft, proof of purchase from an authorized K40 dealer, and proof of insurance reimbursement if applicable.  NOTE: the theft guarantee excludes portable radar detectors.