Features The world"s smallest 3500 lumen LED flashlight Utilizes 4 x CREE XM-L LEDs Integrated multi-function OLED display Thermal protection circuit prevents overheating Compatible with both 18650 Li-ion and CR123 batteries Intelligent charging circuit with voltage detection charges safely and rapidly Exceptionally long runtimes using 4 x 18650 Li-ion or 8 x CR123 batteries Capable of using 1 x 18650 or 2 x CR123 batteries in emergency situations Eight rapidly switchable brightness levels and modes to select from Innovative single button two-stage switch provides a user-friendly interface (Patented) Toughened ultra-clear mineral glass with anti-reflective coating Integrated "Precision Digital Optics Technology" provides extreme reflector performance Stainless steel bezel ring protects core components from damage Constructed from aerospace-grade aluminum alloy HAIII military grade hard-anodized Waterproof in accordance with IPX-8 (submersible to two meters) Dimensions Length: 142mm (5.6") Head diameter: 68 mm (2.68") Head side-length: 57mm (2.24") Tube diameter: 50mm (1.96") Weight: 438g (15.45oz) (without battery) Accessories Charger, quality holster, lanyard and spare O-ring.