An airsoft tracer unit is a device designed to enhance the visibility of BBs during a game of airsoft. It works by emitting a visible light that illuminates BBs made out of glow in the dark material so the shooter can see the trajectory of the BB. This allows players to better track their shots in low-light scenarios. The light emitted is generated by an LED, which is powered by a small rechargeable battery. Tracer units are typically mounted onto the end of an airsoft gun's barrel within a silencer device, and they come in two main types: glow-in-the-dark or infrared. Glow-in-the-dark tracers are the most common type and they are powered by a small LED bulb, while infrared tracers use an LED that emits an invisible infrared light. Tracer units come in different sizes and colors, and they can be used to give your gun an additional tactical edge on the battlefield. In addition to enhancing the visibility of BBs, tracer units can also be used to simulate muzzle flash and give the gun a more realistic look and feel. Airsoft tracer units are a great way to add some extra fun and realism to your airsoft games!