The PolyTac 90X USB 500-lumen tactical light can use either a Streamlight Li-Ion USB rechargeable battery pack or Two CR123A disposable batteries. It's a complete rechargeable system that comes with a charge cord and a Streamlight Li-Ion USB battery that features an integrated micro-USB charge port. It features a switch for momentary or constant on operation, an integrated carabiner style D-ring, and a pocket clip for a variety of attachment methods.