Multi-fuel: Uses two (2) Streamlight SL-B26® protected Li-Ion USB rechargeable battery packs; also accepts four (4) CR123A lithium batteries Features TEN-TAP® programming - Choice of three user-selectable programs: 1) high/strobe/low 2) high only 3) low/medium/high High (SL-B26): 3,500 lumens; 452m beam; runs 1.25 hours High (CR123A): 2,500 lumens; 385m beam; runs 1.5 hours Medium: 1,000 lumens; 237m beam; runs 2.5 hours (CR123A); runs 3 hours (SL-B26) Low: 250 lumens; 120m beam; runs 10.5 hours (CR123A); runs 11.5 hours (SL-B26) Strobe for signaling or disorienting: runs 1.5 hours (CR123A); runs 1.25 hours (SL-B26) IPX7 waterproof to 1 meter for 30 minutes; 1 meter impact resistance tested Durable, anodized aluminum construction Anti-roll head prevents the light from rolling away when placed on a flat surface Rubber sleeve provides thermal insulation and a sure grip 9.53 in. (23.65 cm) 1 lb 3.4 oz (550 g) with two (2) SL-B26 battery packs; 1lb 2.4 oz (522 g) with four (4) CR123A batteries Limited lifetime warranty