1. Carefully pull out the USB jack.
  2. Connect it to the external battery.
  3. Start the battery by pressing the button (Optional).
  4. Press the temperature control switch at chest level for two seconds.
  5. Red light flashes, automatic heating is activated.
  6. The red light flashes for 5 minutes, then automatically returns to white light.
  7. White light on: medium heating temperature has been reached.
  8. Blue light on: power saving is activated.
  9. To stop the jacket heating, press the switch for two seconds.