SureFire EB2 Backup Ultra High Dual Output Flashlight with Tactical Type Switch TIR lens produces tight beam with reach and enough surround light for peripheral vision Virtually indestructible LED emitter regulated to maximize output and runtime Two output levels-high for maximum light, low for extended runtime Tailcap switch option: press-for-momentary activation/twist-for-constant-on Two-way clip permits light to be carried head up or down, or clipped to a hat brim or bill