Come and see our amazing products. Thsi Cube hand warmer is made of ABS and aluminum alloy,Equipped with special lithium ion protection board to effectively prevent overcharge, over discharge, over current, short circuit, etc.,100% safe for user, small size and lightweight, 4 colors for your selection, it is not only to be a power bank for charging any mobile phone, but also can be a hand warmer to keep you warm in winter, double side heating, convenient to carry, this item is widely use for anyplace. your logo is welcome. Pls confirm further with us if any query about packing info, inventory status and time schedule.