Quark AA&sup2; Tactical LED Flashlight S2 177-Lumen Cree XP-G LED Emitter: Premium Cree XP-G S2 5 Current Regulated Output Levels and 3 Flash modes: Strobe, SOS, Beacon T-6061 Aircraft-grade Aluminum Body with a Type III Hard Anodized finish; Fully knurled and includes Impact-resistant glass lens with Dual-coating Reversable/Removable Clip, Flexible & secure finger grip accessory, IPX-8 Waterproofing Powered by: 2 AA batteries (included) with a Voltage range of 0.9V ~ 4.2V