Power Bank Hand Warmer, Joysoul Rechargeable Double-sided Hand Warmer 5200mAH Power Bank Portable Pocket Hand Heater USB Mobile External Back up Battery Charger https://www.amazon.com/gp/product/B0746LN1S1/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1 Amazing gadget for this winter and cold weather, it has a beautiful design and the perfect size for holding it in your hand. This is a multipurpose item that will come in handy for comfort, convenience and emergencies. Serves as a power bank for charging cell phones or other devices. The built in heater can be use for warming hands and sore spots and also warming animals like a shivering chihuahua or Sphinx. Love that it puts long hours and charges quickly.