Winter Electric Heated Scarf 5V 3 Level Adjustable Temperature Scarf USB Charging Heat Control Neck Warmer for Cycling CampingOverview: Instructions for the heating scarf Press and hold the heat compress for 2 seconds to turn on the heat compress mode, and the red light is high temperature heat compress (output 100%). Short press the heating button, the white light is Medium temperature hot compress (output 70%). Short press the heating button, the blue light is displayed as the bottom warm compress (output 38%). Press and hold the heating button for 2 seconds to Directly