The ultra-compact Nano Light II keychain light provides steady, bright light for one hour of run time with a single AAAA alkaline battery. Easily attaches to key rings and zippers, and fits in your pocket without taking up a lot of space. Features20 lumens; 120 candela; 22-meter beam distance; runs 1 hourPowered by (1) AAAA alkaline battery (included)Rotating on/off head switchNon-rotating snap hook for easy one-handed operation when attached to a keychainLED technology, impervious to shock with a 50,000-hour lifetime6000 series machined aircraft aluminum with anodized finishIPX7 waterproof to 1m for 30 minutes2-meter impact resistance testedLength: 2.2 in (5.7 cm); Weight: 0.6 oz (18g)Limited lifetime warranty