The Sunbeam GoHeat Cordless Heating Pad delivers portable soothing heat therapy for pain relief anywhere and anytime you need it. The 9.5 x 12-inch cordless heating pad provides targeted high-level heat therapy to the back arms legs and shoulders—whether you're at home or on the go. Just slip the battery unit/heating pad controller into the pad's side pocket adjust the strap to fit and enjoy hands-free pain relief. This portable heating pad uses a convenient rechargeable lithium-ion battery that runs for up to 4 hours on a single charge on Low setting. The pad heats up fast so you can feel the heat in 30 seconds and offers 3 heat settings for customized treatment. The entire flexible Micromink hot pad and adjustable strap are fully machine washable for easy care—just remove the battery.