Tactical Internal Laser Targeting Systems for Glock handguns. All internal installation. Pistol retains its original factory footprint. 50 mW laser (red, green, blue or infrared). Visible in full direct sunlight and over 1000 yards at night. Rechargeable Li-Ion battery via a micro USB port. Automatic activation using a proximity detector embedded inside the trigger guard . 250 hours operating time (2 hours of lasing time--laser activated) 2 hour recharge time. Available for all Glocks Full size,Compact, Sub-compact and Slimline(G42,G43). (less)