1、There are three gears for temperature adjusting with red light, green light, blue light respectively represent different temperatures. 2、The neck wrap are used for heating therapy to help relieve neck pain and fatigue and relax. 3、There is a string bag on the wrap which is designed for wormwood bag or other medicine bag. 4、The power switch control key is on the usb line, which is more convenient to use and adjust. 5、With carbon fiber, it can heat evenly. But do not wear it while sleeping, avoiding burns. Item Type: Heated Neck Wrap Material: Cloth, Carbon Fiber Size: Approx. 49 x 11cm / 19.29 x 4.33in Input Voltage: 5V2A Heating specifications: red light means high temperature, green light means medium temperature, blue light means low temperature Power supply mode: It is recommended to use the mobile phone charger plug and socket or the USB power port on the computer to supply power How to Use: 1. Connect the USB cable to the neck protector and wrap it around the neck. 2. Insert the power supply through the usb interface. Click the button for the first time, it will display red light, click the button for the second time, it will turn to green light, click the button again, the light will change from green light to blue light, click the button for the fourth time to turn off the heating. 1 x Heated Neck Wrap 1 x USB Data Cable