Fully automatic tracer unit with muzzle flash simulator. Precision CNC machined aluminum construction with weather resistant matte hard anodized finish Built in tracer unit w/ ultra-sensitive sensor ensures reliable BB charging even at high rates of fire Uses common AAA batteries Easy access on/off button High power "flash" provides optimum charging of tracer BBs Simulate muzzle flash as BB's exit the tracer unit The Angel Custom Firework mock silencer series is the ultimate Airsoft mock suppressor that is robust, well constructed and not only improves the look of your Airsoft rifle, but now comes with a built in high ROF tracer unit. The Firework tracer unit utilizes high power LED's with an advanced sensor system that is fast enough to keep up with high rate of fire AEG's. The end of the tracer features a set of amber color LED's which flash to simulate muzzle flash just as the BB exits the unit. Enhance your night game experience with an Angel Custom Hornet Tracer Unit.