The ProTac 2AA-X USB is a slim, tactical flashlight that uses a USB-C rechargeable battery pack and can also accept two AA alkaline batteries as a backup. About the size of a marker, it conveniently fits in your pocket and produces 550 lumens. Producing 550 lumens and 10,250 candela, the ProTac 2AA-X USB flashlight uses Streamlight's proprietary protected lithium polymer USB-C rechargeable battery pack. It also accepts two (2) AA disposable batteries creating 270 lumens and 5,000 candela. This light features a tail cap switch for momentary or constant on operation and three different user-selectable programs.