SME Compact Tactical Handgun LED Light features a rugged body precision CNC machined from aircraft-grade aluminum. It also features a tool-free spring clamp lock for easy mounting to a pistol bottom rail. The SME Compact Tactical Handgun LED Light is also water resistant, and runs off a CR123 battery. This light features a click down switch to toggle through on/off/strobe.FeaturesTool-free spring clampIPX4 water resistantAircraft-grade aluminum2" x 1" x 1" dimensions