Specification: Item Type: Heating Hat Material: Knitting Wool Usage: 1. Connect the power supply and gently press the switch to start. 2. When the red light goes on, the heating hat starts to work. The high temperature range of the red light is about 55. 3. Gently press the green light, and the green light medium temperature is about 48. 4. Gently press to turn the blue light, and the low temperature of the blue light is about 40. 5. Press the lamp to turn off the heating. and in this cycle Package List: 1x Hat 1x USB Cable Electric Heated Beanie Hat USB Rechargeable Outdoor Cycling Windproof Warm For Women Men