Sandberg Hand Warmer Powerbank 10000 is an incredibly useful gadget to have in your bag, whether it is on a cool winter day or on a long mountain hike. The powerbank allows you to re-charge most of your mobile equipment, and you get up to 4 charges of your smart phone. With the integrated hand warming feature you can easily and comfortably warm your hands by holding the powerbank. The powerbank is a compact and solid construction made of a water repellent material.