TRUGLO Micro-Tac Tactical Micro Laser Next generation, HIGH-EFFICIENCY SUPERCONDUCTOR LASER diode; Pulse and constant laser modes EASY AMBIDEXTROUS PUSH-BUTTON ACTIVATION for left and right-handed users; Recessed on/off buttons eliminate accidental activation; Automatically shuts down a Choose between a POWERFUL 520NM GREEN LASER or a POWERFUL 650NM RED LASER; Operating temperature: 14 F (-10 C) TO 122 F (50 C) LIGHTWEIGHT: weights less than 1 ounce; Made of lightweight CNC-machined aircraft-grade aluminum Mounts to standard picatinny or weaver-style rails; Windage and elevation set-screws