The ProTac 2.0 Headlamp is a 2,000-lumen flashlight that uses a proprietary Streamlight SL-B50 protected Li-Ion rechargeable battery. The ProTac 2.0 Headlamp features three different user selectable programs. The Streamlight SL-B50 charges directly via USB-C port in the body of thebattery. The battery is keyed to ensure proper alignment of the charging port. Includes a USB-Ccord, rubber and elastic head straps and an SL-B50 battery.