Another take on the Acetech Bifrost tracer unit with this video from JKArmy... "The Bifrost simulates muzzle flash, with Multi-color flame effect.The effect of flame depends on volume of gas or fog around the muzzle, more volume makes better effect. Also, the Bifrost provides colored BBs track function which can be achieved by standard BBs with the built-in RGB Flame LED.

It has two tracer modes available - Standard/Sniper and with 11 different modes available for Multi-color flame function.

Other feature is Intelligent power control: Blaster Module power on by shaking, enter
sleep mode while idle for over 5 minutes and it is suitable for standard airsoft and gel BBs."