Product parametersMaterial: ABSInput voltage: DC5VWorking current: 3.7V, 0.91-1.85AWorking time: 3-6 hoursCOLOR: BlueHeating temperature: 36-58 degreesBattery capacity: 3000mahOperation instructions1, Long press the on button (button has a bump) for 3 seconds to turn on, the default 50 degrees. Short press to adjust the temperature upward, up to 58 degrees.2, Long press the shutdown key for 3 seconds to shutdown, short press to adjust the temperature downward, the lowest 36 degrees.3, 2 keys pressed at the time, you can switch the temperature Celsius or Fahrenheit display mode. (New version will be improved soon)4, When the remaining of the device is less than 3 percent , the screen digital flashing, the need for timely charging.5, shutdown state, a short press on or off key, you can view the device statusPackage Contents:1 x C01 Graphene Heated Neck Warmer1 x cableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.