Features: *1. It has 11 heating zones: back, neck, shoulders, waist, and abdomen, providing all-rounded warm for your body. And can withstand the severe cold -40℃ low temperature. *2. Designed with 3 temperature modes for meeting your different needs. Double control switch, can separately adjust the heating area of the front and the back heating area, more personalized warmth and can extend the heating time. *3. Fast heating and heat preservation in 3 seconds, no need to wait, heat release, long press for 3 seconds to open. General USB interface power supply, longer service life, anti water splashing and washable. With mobile power storage pocket, easy to travel. *4. Hand and machine wash. Do not wring it dry by hand. Disconnect and remove the power supply before wash and dry the vest before heating. *5. The in-depth mechanism of the constant temperature of the far-infrared carbon fiber heating sheet helps to eliminate the dampness and cold in the body, keeps you warm in cold winter conditions without wearing thick clothes. Description: *1. Temperature Shift(Manual adjustment) Warm: 55 ℃ (Red Light) Comfort: 45 ℃ (White Light) Energy Saving: 40 ℃ (Blue Light) *2. Material: Polyester *3. Color: Black, Grey *4. Size: M/L/XL/2XL/3XL/4XL/5XL/6XL *5. Power Supply Interface: USB How to Use: 1. Take out the USB plug. 2. Insert the mobile power. 3. Turn on the mobile power. 4. Press the chest temperature control switch for two seconds. 5. The red light flashes, means heating automatically. 6. After red light flashes for 5 minutes, then automatically turn to white light, means medium temperature. 7. Manual adjustment has three level, red light means hign-temperature heating continuously. White light means medium heating continuously, blue light means low heating continuously. 8. Press the temperature control switch for two seconds to turn off and stop heating.