iiAnferny quickly talks about affordable tracer units from T328. The T238 NANO Tracer unit is specifically engineered for BB/Gel blasters, enables BB/Gel balls to illuminate in the dark by attaching it to your blaster. The T238 LITE+ tracer unit is a compact device specifically engineered for small Airsoft and Gel ball blasters. It attaches to your blaster and enables your BB or Gel ball to illuminate in the dark, allowing you to track the trajectory of your shot. However, it both require the use of special tracer BBs or Gel balls.