1.Lithum-ion Battery rechargeable hand warmer 2.can charge to Ipad,Iphone,=1.5pcs Iphone battery 3.Charged by USB 1. With an 3000mah Lithium–ion battery,could be recharged up to 500 times.safe and long life.2.Duble side warming,steeless shells on front and back,comfortable3.Portable design,convient for travel,school , outdoor sport and cold enviorment4. With smart warming function:a.With a samrt ...