1.Lithum-ion Battery rechargeable hand warmer 2.can charge to Ipad,Iphone,=1.5pcs ... and back,comfortable3.Portable design,convient for travel,school , outdoor sport and cold enviorment4. With smart warming function:a. ... a samrt IC for Inteligent temperature control ,keep hand warmer run between 40°C-55°C,safe and comfortableb. ... size:88*83*33mm; NW:110g;GW:200g rechargeable hand warmer and mobile power