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 Streamlights 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. Product Specifications Brand: Streamlight Category: Flashlights Model: ProTac 2AA-X USB Flashlight Color: Black Anodized OAL: 6.00" Material: 6000 Series Aluminum Run Time: 2.25-16 Hours (Lithium Polymer) / 2.5-48 Hours (AA) Output: 40 / 500 Lumens (Lithium Polymer) / 18 / 270 Lumens (AA) Rechargeable: Yes Switch Type: Push Button Tail Cap Battery Size: USB-C Rechargeable Lithium Polymer Battery / AA Alkaline Batteries Proofs: Waterproof Modes: TEN-TAP Programming / Low / High / Strobe / Constant / Momentary Power Source: Battery Body Diameter: 0.70" Bulb Type: LED Head Diameter: 0.90" Includes: ProTac 2AA-X USB / Battery / USB-C Charging Cord / Holster / Pocket Clip Nominal Voltage: 3.7 Volts Rated Capacity mAh: 1,600 Lens Type: Glass Weight: 3.50 oz Range: 54-203 Meters (Lithium Polymer) / 40-141 Meters (AA) Charge Time: 4 Hours Filter Color: White