Features: The world smallest 3500 lumen LED flashlight 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 times x 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 Head diameter: 68 mm Head side-length: 57mm Tube diameter: 50mm Weight: 438g (without battery) Accessories: Charger, quality holster, lanyard, and spare O-ring Note:Please kindly be noticed that batteries are not included.