You Asked, we listened! our dual switch technology is now available in the strion DS HL for maximum illumination with a wide beam. Strobe for disorienting or signaling your location: runs 2.5 hours. C4 LED technology for extreme brightness. Lithium Ion battery is rechargeable up to 1,000 times; fully recharges in 3 hours. Clamp style charger holder with digital control circuit 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. IPX4 water-resistant; 2M impact resistance tested. 6000 Series anodized machined aircraft aluminum; borofloat high temperature glass lens. Anti-roll head prevents the light from rolling away when you set it down. 6.33-Inch (16.08 cm); 5.4-Ounce (153 grams). serialized for positive identification.