The ProTac HL® USB provides incredibly bright light with multiple power source capability. The 1,000 lumen beam is powered by a single lithium-ion battery, an 18650 rechargeable lithium-ion battery or (2) CR123A batteries. Keep it powered up by connecting to a USB port, so it’s always ready to go. The anti-rattle battery compartment keeps batteries securely and quietly in place and doesn’t need a battery carrier. TEN-TAP® programming lets you choose the selection of operating modes (high/strobe/low, high only or low/medium/high). IPX4 rated for water resistance.