happy heat heating pad hands, electric water bag, arthritis hand warmer, auto-shut off- lavender happy heat slide your hands into happy heat electric heating pad and sit back and relax after a long day. plug in the ac adapter for 12-15 minutes then unplug the power cord to enjoy a soothing heat up to 5 hours. it will help to relax your pain or soothe your hands. happy heat distributes hot remedy devices by transforming the traditional hot water bottle in a 21st-century technology to save time and energy.