Knuckles GSM gives shares his impression on the T328 Nano tracer unit. The T238 NANO Tracer unit is a compact, lightweight accessory for BB/Gel blasters that illuminates your projectiles in the dark. By attaching to your blaster, this carbon fiber device, powered by a 300mAh battery, enables you to track the flight path of special tracer BBs/Gel balls. With a simple shake-to-activate function and automatic shut-off after 20 minutes, the T238 NANO offers convenient and efficient use, available in red and green versions for added versatility.