For use on Glock 20/21/20SF/21SF (Gen 1-3) N/A Imported LaserMax Native Green Technology - The choice of elite professionals Pulsed for increased visibility Guaranteed factory alignment Internal design will not interfere with holster or grip selection Distinct ambidextrous On/Off switch won't turn on automatically; Class IIIa Laser Product: &lt;5mW power output Class IIIA laser, &lt;5mW power output