The popular RRT-0 has been redesigned, now with infinite light ramping magnetic sensor technology. The new RRT-0 runs on a single CR123, RCR123, or AA sized battery (need included AA extender). Features: Specially designed for Military, Law Enforcement, Self-defense, Hunting, Search, Rescue and Outdoor activities. CREE XM-L T6 LED. Max output is 550 lumens with an effective range of 150 meters. The Rapid Response Control Ring allows you to easily select different brightness levels. Infinite brightness accessible. Stainless steel rapid response control ring for durability and reliability. Stainless steel bezel protects the head and tailcap from drops and impacts. Newly designed high efficiency broad voltage drive circuit. Tail stand as a candle. Impact-resistant accords with US MIL-STD-810F. IPX-8 standard waterproof (2 meters). Specific captions: Model: RRT0 XML. LED: CREE XM-L T6. Maximum output: 550 lumens. Reflector: Custom-designed aluminum reflector. Lens: Toughened ultra-clear mineral glass with anti-reflective coating. Material: Aero grade aluminum alloy. Finish: HA III military grade hard-anodized. Battery: RCR123*1/CR123A*1/AA*1. Switch: Forward clicky. Dimensions: Head diameter 25.4mm, Tube diameter 20.5mm, Total length 100mm (without extension tube), Total length 116mm (with extension tube). Weight: 72g (without extension tube) (without battery), 83g (with extension tube) (without battery). Output & Runtime: Using CR123 Battery-High Mode 550 Lumens, 50 minutes.