Cree MC-E LED with lifespan of 50,000 hours • 2 modes with 8 types of output -4 types of primary output:Turbo (630 Lumens, 2Hrs) ?Low (13 Lumens, 150Hrs) ?Mid (93 Lumens, 20Hrs)?High (277 Lumens, 6.8Hrs) -4 types of strobe mode: Strobe?Slow flash?SOS?Fast flash • Digitally regulated output - maintains constant brightness • Uses eight 1.5V AA (Alkaline, Ni-MH) batteries(4 AA batteries is available in emergency) • 208mm(Length)x62mm(Diameter) • Made of T6 aircraft-grade aluminum • Durable Type III hard-anodized anti-abrasive finish • 284-gram Weight (excluding batteries) • Waterproof to IPX-8 Standard • Toughened ultra-clear glass lens with anti-reflective coating • Push-button tailcap switch • Capable of standing up securely on a flat surface to serve as a candle • Included accessories: shoulder strap,two spare o-rings, and a rubber switch boot