Nitecore's explorer line of lights offer an incredibly efficient interface and brilliant construction designed to withstand the punishments of heavy outdoor use. The EC2 is built from aerospace grade aluminum, machined with non-slip knurling and fitted with a removable pocket clip. Its compact size and durable build make the EC2 an ideal Every Day Carry. Powered by 2 x CR123 cells, the EC2 can generate up to 320 lumens. The unique switch layout located on the bezel of the light features two separate buttons for constant/momentary activation and mode selection. The interface allows rapid selection of the light's 5 output modes, an SOS function, and a disorienting strobe. A red power indicator serves as a standby light so you can locate your device in a dark tent or campsite. Nitecore produces some of the world's most powerful and reliable lights and has put its years of experience into the beautiful and capable explorer series. Features and Specifications: 5 brightness levels Output/Runtime: 320 Lumens/30 Minutes 220 Lumens/3 Hours 80 Lumens/11 Hours 15Lumens/50 Hours 2 Lumens/200 Hours Momentary push-on strobe and SOS modes Dimensions: Length: 3.9" (99mm) Head Diameter: 1" (25.4mm) Tail Diameter: .94" (24mm) Weight (w/o Batteries): 2oz (59g) CREE XP-G (R5) LED Dual switches for efficient interface Secondary red light mode (0.2 lumens) Power indicator light also serves as battery voltage indicator (accurate to 0.1V) Power indicator light serves as standby indicator light when powered down Toughened ultra-clear mineral glass with dual-side anti-reflective coating Smooth reflector Constructed from aero grade aluminum alloy HAIII military grade hard-anodized Stainless steel bezel retaining ring protects core components from damage Detachable two-way anti-rolling clip IPX-8 Waterproof (2 meters submersible) Tail stand function Uses 2 x CR123A, 1 x 18650 (rechargeable), or 2 x RCR123A (16340)* (Not Included) *When EC2 is driven by 2 RCR123 batteries, the battery capacity indicator function cannot be activated normally. Accessories: Quality holster, lanyard, spare O-ring