The Super Bee kit is the #1 must-have hopup for any 2-cycle gas RC. 

Stop Runaways! 

Works on most all gas RC cars and trucks.

• This Super Bee kit kills your 2-cycle gas engine on command, during a radio glitch, low battery, or total battery power loss
• The Super Bee is 4 kill switch versions in one. No need for multiple versions for different radios. Just flip the dip switches to change how the Super Bee functions. The Super Bee works with most 2, 3, 4+ channel AM,FM, 2.4ghz radios
• Compatible with 4 to 9v receiver battery (2S LiPo compatible)
• Adjustable low battery voltage cutoff: Choose from 3, 4, 5, 6v cutoff (great for LiFe or LiPo packs)
• Adjustable glitch sensitivity
• Multi color built-in LED
• Buzzer output with multiple tones
• LED output, which can power up to 4 sets of Killer RC 6v LED headlights
• Dual engine temp sensors w/ adjustable high temp kill (optional temp sensors coming soon)
• Data Logging, (optional add-on module coming soon)
• Half the size of the Killer Bee kill switch
• Double insulated ignition coil wiring with quick disconnect, and EMI filter
• Detailed instructions included

Note: For a limited time, a buzzer is included for free. The old "killer bee" buzzers and Light do not fit the new "Super Bee" kill switch. The Super Bee remote mount LEDs are now available. The Super Bee can also power most any 6v LEDs, like the Killer RC Iris lights, Baja headlights, tail lights, etc.

Online instructions for the Super Bee. http://www.killerrc.com/faq/instructions_files/SuperBee%20Instructions.pdf 

Here is info on how to set up your radios' Aux channel to work with the Super Bee.
http://www.killerrc.com/forum/viewforum.php?f=13

Updated Kill Switch & Radio Compatibility chart. http://www.killerrc.com/faq/comparison_chart.php