The largest of the Explorer series, the NiteCore EC2 Explorer Flashlight also features the strongest output, maxing out at 320 lumens. Powered by two CR123 batteries (not included), the NightCore EC2 Flashlight is a powerful everyday-carry pocket thrower that can cast a beam up to 150 meters into the darkness. This water-proof flashlight is built to last, with a durable and powerful CREE XP-G R5 LED bulb. The Nitecore EC2 Compact Flashlight features sophisticated power management with a high efficiency circuit that enables maximum runtime of up to 220 hours, and 5 brightness levels to suit your needs - not to mention momentary-on strobe and SOS modes for emergencies. For low lighting levels, you can preserve your night-adapted vision with the secondary red light mode (0.2 lumens), making the NiteCore Explorer EC2 Super-Compact Flashlight an ideal choice for exploring at night, caving, camping and stargazing. This NightCore Flashlight is great for everyday use, but it's built to military standards, with an aero grade aluminum alloy body that's HAIII military grade hard-anodize finished, an a stainless steel bezel retaining ring that protects core components from damage. And since this pocket flashlight is made for the outdoors, the NiteCore EC2 Explorer Pocket Flashlight is waterproof to two meters' depth.