1. Product parameters - Material: ABS - Input voltage: DC5V - Working current: 3.7V, 0.91 - 1.85A - Working time: 3 - 6 hours - COLOR: Blue - Heating temperature: 36 - 58 degrees - Battery capacity: 3000mah 2. Operation instructions - Long press the power on button (button has a bump) for 3 seconds to turn on, with the default temperature at 50 degrees. Short press to adjust the temperature upward, up to 58 degrees. - Long press the shutdown key for 3 seconds to shutdown. Short press to adjust the temperature downward, with the lowest temperature at 36 degrees. - Press 2 keys at the same time, and you can switch the temperature Celsius / Fahrenheit display mode. (The new version will be improved.) - When the remaining power of the device is less than 3%, the screen digits flash, and charging is required. - In the shutdown state, a short press on the on/off key can show the device power status. 3. Package Contents: - 1 x C01 Heated Neck Warmer - 1 x cable Only the above package content is included, and other products are not. 4. Note: Light reflection and different displays may cause the color of the item to be a little different from the real thing. The measurement allowed error is +/- 1 - 3cm.