USB input safety: USB sleeping bag liner is powered by USB mobile battery (not included), DC input, so you don't have to worry about overvoltage or overcurrent. Protection function: Heated seat cushion has an abnormal temperature protection function to prevent excessive temperature. Sleeping bag cushions in winter will keep you warm and comfortable. Washable and skin-friendly: Heated sleeping bag liner's polyester fabric is soft to the touch, , and has the characteristics of anti-lice, deodorant, low moisture absorption, and quick-drying. Machine washable (please put in laundry bag first). Household outdoor applications: electric heating pads can be used as home insulation pads and heating pads for outdoor sleeping bags. It is suitable for various scenes such as camping, mountain climbing, disaster prevention, work, and home. Warm and comfortable: Heated sleeping bag paduses high-insulation hollow cotton inside to keep heat at all times! Thermal pad with outstanding durability, safety and flexibility.