Item title: Mastiff M3 3 Watt CREE XR-E Blue LED 200 Lumens 1-mode On-off Lamp Long Shot Beam Hunting Flashlight Torch Model: M3 Color: Black Material: 6061T aircraft Aluminum HA III hard anodized construction Lens: High temperature processed toughened clear anti-reflective coating glass lens Reflector: Smooth Aluminum reflector Lamp: 3 Watt CREE XR-E blue LED assembly Beam shot distance: Up to 300 meters Run time: 2.5 - 6.5 hours(depends on battery capacity) Lifespan: Average 10,000 hours Mode: On - off Operating voltage: 3.2V - 8.4V Power supply(NOT included): 1 x 18650 / 17670 Li-Ion battery or 2 x CR123A / 17335 / 16340 / 18350 Li-Ion batteries Switch: End cap press on-off switch Dimension(mm): 178 (length) x 26(body) x 48(head) Weight(g): 215 A nylon lanyard is included Shock resistant, slip-resistant body design Ordinary waterproof standard with O-ring sealed, splash proof, be OK to use in rainy days Step down constant current driver, high efficiency with dual mode DC-DC regulator. Replace battery when the light goes dim