See for yourself the improved performance of the Fenix TK15 flashlight. The TK15 offers four brightness levels starting with a bright 400 lumens output for 2 hours in turbo mode or 171 hours of run time at 6 lumens in low mode. The high intensity LED bulb sits in a deep-dish reflector which creates a more powerful, focused beam with an outstanding beam throw distance of 826 feet. You have the option of using one 18650 rechargeable Li-ion battery or two 3V CR123A Lithium batteries (batteries not included). Valued features include four brightness levels plus a strobe mode, side dimmer button, digitally regulated output to maintain constant brightness, and a memory circuit to return the flashlight to the same brightness level at shutoff. Waterproof and constructed of aircraft-grade aluminum with a hard anodize finish, the Fenix TK15 clips on for instant availability in the field.