SureFire E2E-HA Executive Elite Handheld Flashlight, Hard Anodized Batteries - Two lithium 123A 3.0 Volt with 10-year shelf life High-strength aerospace aluminum body, anodized (SG) or Mil-Spec hard-anodized (HA) for durability Length and weight (with batteries) - 4.5 inches / 3.2 ounces Tailcap click switchpress for momentary-on, press further to click constant-on Lightweight and slim, with an upgraded removable stainless steel pocket clip