Features1There are three gears for temperature adjusting with red light, green light, blue light respectively represent different temperatures. 2The neck wrap are used for heating therapy to help relieve neck pain and fatigue and relax. 3There is a string bag on the wrap which is designed for wormwood bag or other medicine bag. 4The power switch control key is on the usb line, which is more convenient to use and adjust. 5With carbon fiber, it can heat evenly. But do not wear it while sleeping, avoiding burns.SpecificationItem Type: Heated Neck WrapMaterial: Cloth, Carbon FiberSize: Approx. 49 x 11cm / 19.29 x 4.33inInput Voltage: 5V2AHeating specifications: red light means high temperature, green light means medium temperature, blue light means low temperaturePower supply mode: It is recommended to use the mobile phone charger plug and socket or the USB power port on the computer to supply powerHow 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.Package List1 x Heated Neck Wrap 1 x USB Data Cable