Krale Airsoft explains how tracer units in airsoft work to help those unfamiliar with these units and their use in airsoft apart from being tools for light shows in a game... "If you are new to airsoft, the term “tracer unit” probably raises a number of questions. The most obvious is: what is an airsoft tracer? If you've seen action movies or war documentaries, you've probably noticed that some firearms fire a type of bullet that is visible as it flies through the air. This effect can be replicated on airsoft replicas through tracer units, where the BBs can glow as they exit the replica's barrel. This makes following the flight trajectory a lot easier, which in turn ensures that you can shoot more accurately.

But what are the different options and how do these tracer units work?"