Streamlight's Protac HL USB is a USB rechargeable, 850 Lumen tactical flashlight. The Protac HL USB can charge from almost any USB source, and also accepts multiple battery sources to use as a back-up so you'll always have power when you need it.
TEN-TAP Programming - Choice of three user selectable programs: 1) High/Strobe/Low - 2) High Only - 3) Low/Medium/High
High for maximum illumination: 850 lumens
Medium for bright light and longer run time: 350 lumens
Low for a less intense beam and extended run time: 85 lumens
Strobe for signaling or disorienting: Runs 1.5 hours
Uses lithium ion battery; also accepts two 3V CR123A lithium batteries or rechargeable 18650 USB battery.