Police Security Ryder Twin Power 550 Lm. LED Headlamp. Seamlessly switch between. Rechargeable and alkaline power sources. Built-in rechargeable battery in the headlamp for quick, easy charging. Rear battery cartridge holds 3 AAA batteriesfor backup power. 550 lumens of powerful illumination for dark environments. 150-meter beam distance for long-range visibility. Adjustable comfort straps for extended wear. Lightweight & balanced design to reduce strain. 14-hour maximum runtime for all-night visibility. Rechargeable & AAA-powered options to avoid downtime.