Streamlight BCRF Nano Light II flashlight with 20 lumen output. Features 120 candela, 22 meter beam distance, and a run time of 1 hour. Power: one AAAA alkaline battery (included). Rotating on/off head switch and a non-rotating snap hook for easy one-handed use when attached to a keychain. LED technology with a 50,000-hour lifetime. Housing: 6000 series machined aircraft aluminum with anodized finish. IPX7 waterproof to 1 meter for 30 minutes and 2-meter impact resistance. Length 2.2 inches, weight 0.6 ounces. Limited lifetime warranty.