USB charging battery dock simultaneously charges 2 devices via USB ports. Maximum 2 amps shared output. 3 internal charging wall pockets can hold a tablet, phone and/or camera and can charge 2 devices through a USB connection to a 20V MAX Lithium battery pack. Low battery cut-off protection monitors battery voltage to avoid battery over-depletion. Integrated 2-level LED light system allows adjustment for wide area illumination or close-up work. Multiple interior panels hold a multitude of tools and accessories like drills, extension cords, pliers, screwdrivers, wrench sets, drill bits, testers and much more. 31 multi-use pockets inside and 2 outside help organize a wide variety of hand tools. Padded web carrying handles and adjustable shoulder straps make carrying more comfortable and convenient. Large pads on back for extra comfort makes carrying heavier loads more comfortable on stress areas of the back. Easy double-pull, heavy-duty zipper. Base pad feet helps reduce wear and abrasion. Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18.