For shooters who prefer momentary-on white light applications, but still want a small, low-profile footprint for optimized space and ergonomics. A single press of the button will activate your light in a momentary-only manner. Your REIN weapon light will only activate while the button is pressed and will immediately turn back off once pressure is lifted from the button.Features :,Length: 1.16";"Width: 1.23"""Height: 0.46";"Cable Length: 5.5""