Specification:

CAL .9mm Laser Bore Cartridge - Fits CAL .9mm Rifle

Red Laser: 635-655nm, Max output<5mw, Class IIIa Laser

Easy to use, just install the batteries into the Laser cartridge and screw on the base, which turns the laser on. Remove Batteries to turn unit off

Factory Pre-Aligned Cartridge Bore Sighters, helps with Zeroing your optics

Brass Construction