USE ANYWHERE - Our USB heating pad is 12 "x24". Comes with a 5.9 foot USB cable that is compatible with most 5V USB outlets such as your own power bank, USB adapter. MUST BE CONNECTED TO POWER SOURCE - USB heating pad not included battery and cannot be recharged, package not included power bank and USB adapters. HEATING LEVELS & AUTO OFF - High temperature (130 - 140), medium temperature (112 - 122), and low temperature (100 - 104). Built-in intelligent control chip to ensure stable heating and prevent overheating. 45 mins auto-off, safety and energy saving. RELIEVES PAIN - Comfortable heated dressing for your back, abdomen, neck, shoulders, legs, feet. Relieves fatigue, relieves stiff shoulders, tight lower back muscles, abdominal pain, menstrual cramps, cold feet, provides pleasant muscle relaxation, improves blood circulation, etc.