Please use mobile power. At the same time, our products do not include mobile power Note: We recommend using 5V / 2A at Ensure a good heating effect Instructions: 1. Check the USB socket 2. Access to the treasury 3. Adapter on the switch for charging the external battery 4. Humidity temperature sensor on the humidity temperature sensor for 2 seconds Zone 9 heating This model is an upgraded version. The heating effect is the best. It can reach the whole body heating state. There are original heating elements on the front and back. At the same time, the power consumption is also very fast. It can also produce effects at extremely low temperatures. Zone 2 heating This version is the most economical. Only the backpack and the neck are heated. It contains two heating elements. The energy consumption is the lowest. The heating time is the longest.