The ProTac HL4 uses a total internal reflection optic to produce a concentrated beam of 2,200-lumen bright light with optimum peripheral illumination. The ProTac’s multi-function, push-button tactical tail switch allows for easy one-handed operation. The TEN-TAP™ programmable switch allows you to select which lighting program to use: high/strobe/low (the factory default), high only, or low/med/high. Constructed of durable aircraft aluminum, the ProTac HL4 features an anti-roll head that prevents the light from rolling away when placed on a flat surface, a rubber sleeve that provides thermal insulation and a secure grip, and a lanyard and a nylon holster that enable easy carrying and deployment. The ProTac is also IPX7 waterproof down to 1 meter for 30 minutes and impact resistance tested to 1 meter. A “dual fuel” light, the ProTac can be powered by four 3V CR123A lithium batteries (included) or two rechargeable 18650 lithium batteries; LED Solid State power regulation ensures maximum light output throughout the batteries’ lives. Streamlight’s ProTac HL4 C4 Tactical Light is excellent for use in law enforcement, security, emergency medical services, sporting goods, hardware/tool, and other consumer applications.