TEN-TAP® programming allows for selection of three different operating programs: 1) high/strobe/low 2) high only 3) low/medium/high Multi-Fuel: Uses one (1) Streamlight SL-B26® protected Li-Ion USB rechargeable battery pack; also accepts two (2) CR123A lithium batteries High, medium, low, and strobe modes: High: 1,000 lumens; 171m beam; runs 2.5 hours (CR123A); runs 1.75 hours (SL-B26) Medium: 300 lumens; 91m beam; runs 4 hours (CR123A); runs 4.75 hours (SL-B26) Low: 65 lumens; 42m beam; runs 21 hours (CR123A); runs 24 hours (SL-B26) Strobe runs 2.5 hours (CR123A); runs 3.5 hours (SL-B26) Multi-function push-button head switch easy to use with gloved hands Removable pocket clip attaches to molle, turnout gear, harnesses, etc. Durable, anodized aluminum construction with impact-resistant glass lens IPX7 waterproof to 1m for 30 minutes; 2m impact resistance tested Length: 4.39 in (11.1 cm) Weight: 4.9 oz (139 g) with SL-B26 battery pack; 4.4 oz (125g) with CR123A lithium batteries Limited lifetime warranty