The 600-lumen PolyTac X USB flashlight, built for durability and a sure grip, as a complete rechargeable system that includes our new Streamlight SL-B26 protected Li-Ion USB rechargeable battery pack with an integrated micro-USB charge port. The Ten-Tap programming lets you choose one of three modes of operation: 1- high/strobe/low, 2- high only, 3- low/medium/high. It is constructed of polymer with superior grip texture, O-ring sealed glass lens, and push-button tail switch.