20 lumens; 120 candela; 22-meter beam distance; runs 1 hour; Powered by (1) AAAA alkaline battery (included); Rotating on/off head switch; Non-rotating snap hook for easy one-handed operation when attached to a keychain; LED technology, impervious to shock with a 50,000-hour lifetime; 6000 series machined aircraft aluminum with anodized finish; IPX7 waterproof to 1m for 30 minutes; 2-meter impact resistance tested; Length: 2.2 in (5.7 cm); Weight: 0.6 oz (18g); Limited lifetime warranty