DUAL SWITCH TECHNOLOGY – Both a tail and head-mounted switch for maximum flexibility. Switches operate independently. TEN-TAP® Programming - Choice of three user selectable programs: - High for a super-bright beam: 700 lumens; 219m beam distance; runs 1.25 hours - Medium for bright light and longer run time: 300 lumens; 141m beam distance; runs 3.5 hours - Low for a less intense beam and extended run time: 40 lumens; 57m beam distance; runs 24 hours - Strobe for disorienting or signaling your location: runs 2.5 hours Clamp style charger holder that prevents over-charge; LED indicates charge status PiggyBack® charger doubles your run time by charging a spare battery (sold separately) so you can keep on working; reduces down time Anti-roll head prevents the light from rolling away when you set it down IPX4 water-resistant; 2m impact resistance tested Durable machined aircraft aluminum construction; Borofloat high temperature glass lens 6.33” (16.08 cm); 5.4 oz (153 grams) Serialized for positive identification Limited lifetime warranty