... constant temperature: 40 °C or so, don't need to keep warm warm can pull out when ... :wool,cotton fabric,vaccum catton,exothermic padding,embroider,usb cable. thick plush+heat tablet+nature rubberColour:any ... assure the safety of users,it would don't harm your bodySpecifications1.hand warmer 2.use ... heating material,warm your hand,when operating yourcomputer,USB charging,mouse pad warmer1.Warm your hands ...