Features: 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 50000-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