MANUAL OPERATION1. Fully charge the power bank and then connect it to the USB socket in the vest pocket.2. Put it in your pocket and close it.3. Press and hold the controller until the red light comes on. It means the vest is working.4. If the button is not pressed, it will automatically switch to medium temperature mode after 5 minutes. You can change the 3 temperature mode by pressing the switch.5. If you want to turn it off, press and hold the LED button until the light turns off.6. When the power bank is empty, take it out and charge it.Delivery content1X Heated Vest with USB Cable (not include power bank)1X user manualWarm, safe and smart heated clothing is becoming a necessity, as are smartphones.Washing instructions1. Remove the power bank2. The USB port is insulated and waterproof. It is recommended to wash with a protective silicone cover.3. Hand wash on gentle cycle in cold water; The vest must be placed in the laundry bag. Machine wash or dry wash4. Iron online and at low temperature.5. Do not tumble dry, but hang the vest up after washing.