C4 LED: High- 4,700 candela peak beam intensity, 125 lumens, Runs up to 2.75 hrs; Low- 700 candela peak beam intensity, 20 lumens, Runs up to 15 hrs. Ultra Bright Green LEDs: 3.5 lumens; Runs up to 28 hrs; for use when true night vision preservation is not necessary. Green indicator type LED preserves complete dark adaptation per MIL-1472D (<0.05 lumens); for use when true night vision preservation IS necessary. Dual Switch System features an engineered tailcap switch for Power On/Power Off and Signal. Tailcap switch: On/Off and Signal. Mode Switch Select Sequence - (2) Ultra-Bright LEDs /(1) Indicator-type LED / C4 LED High / C4 LED Low. Micro faceted reflector for smooth focus. Powered two 3V CR123A lithium batteries. Corrosion resistant aircraft grade aluminum coated with MIL SPEC Type II anodize for superior wear andabrasion resistance. Limited lifetime warranty.