Keep your hands always warm regardless of the actual weather with the Smart Warmer. It comes with two functions. One of them charges your phone through a USB charger, whereas the other one transfers a warm temperature through your hands.
The Smart Warmer can be bought either in the version of 4400 mAh or in the one with 2000 mAh. Still, the two functions cannot be used at the same time – only one at a time.