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This tracer unit illuminates with front LED to simulate the flame of a firearm. The tracer comes with an 11mm thread (suitable for WE, TM, etc) and a 14mm CCW adapter. It can light up to 35 rounds per second. Depending on your play style, the built-in battery will keep you safe all day. As a special feature, you can choose from 8 different colors for the tracer flash. Different colors can be used, for example, to identify the team to which the tracer user belongs. The rechargeable battery is fixed and not interchangeable.