Check it out! 
https://www.youtube.com/watch?time_continue=6&v=jVYdMHXX7Lk
 
) High power UV LED technology.
) Battery last up to 20,000 rounds.
) Can sustain tracer function up to 35 RPS (2100 RPM).
) 2 side light sources for optimum illumination.
) Integrated Motion sensor inside.
) Built-in Lithium battery.
) Battery level indicator.
) Automatic power on / power off control by Motion sensor.
) USB Charging ready.
) For use with GREEN glow in the dark BBs only.
) When no longer to use it, charge battery every 2 months.
 
Specification:
) Color: Black
) Diameter: 29mm
) Length: 60mm
) Threads: 11mm CW
) Weight: 41g
) Material: Aluminum
) Included: 14mm CCW Thread Adapter
 
Worlds Smallest Tracer Unit on the market