TYPE-C charging port, Shake to turn on the power, Automatically shut down after 20 minutes T238 NANO Tracer unit is designed for BB/Gel blasters, it attachments to your blaster which allow your BB/Gel ball to glow in the dark. To see the flight path of your shot, special tracer BBs/Gel balls are needed. Main features Outer diameter: 28mm Inner diameter: 10mm Height: 53mm Battery: 300MAH Weight: 23g Material: carbon fiber Adapter：14mm CCW to 11mm CW packing include 1* tracer 1*14mm ccw to 11mm cw adapt 1*charge wire