Hotrox hand warmers are a brand new way of keeping your hands and other parts of your body warm these reusable hand warmers are recharged by plugging it into a computers usb port hot rox hand warmers are simple safe and easy to usehotrox electronic hand warmer and usb lead this handy version can becharged from any 5v usb charger so from a laptop pc a usb car chargeror a traditional mains usb charger hotrox comes with 2 heat settings providing up to 6 hours of heat on the medium settin