Simulates muzzle flash, the effect of flame depends on volume of gas or water fog around the muzzle, with more volume, effect will be better Two modes available: Tracer with flame, Tracer only 40 Min auto power off Suitable for standard airsoft and gel BBs suggest to recharge the device 3months a time for saving the battery life Suitable for green tracer BBs (not for red BBs) Size: 67 x 27mm (L x Dia.)