The Streamlight ProTac 2AA-X USB is a slim tactical flashlight that offers multi-fuel flexibility for professional use. It delivers 550 lumens using the included proprietary lithium polymer USB-C rechargeable battery pack and can also run on two AA alkaline batteries at 270 lumens as a backup. Approximately the size of a marker, it features three user-selectable programs and a durable glass lens. Black Anodized Aluminum construction, OAL 6, Head Diameter 0.90, Weight 3.50 oz, Waterproof, modes Constant / Momentary. This kit includes the rechargeable battery, a USB-C charging cord, a holster, and a pocket clip. It provides up to 16 hours of runtime on the lithium pack or up to 48 hours when using AA batteries.