How do I turn on UNIT-4?

Hold the middle button for 2 seconds.

Steps

1. Hold the middle button for 2 seconds.
2. Double press the middle button to see the battery level.

If it doesn't work

• UNIT-4 stays off. Plug the power supply into the socket on the back and into the mains. Hold the middle button for 2 seconds again.
• UNIT-4 charges by USB-C. UNIT-4 (Model: MKI) charges by DC. Please follow the steps in How do I charge UNIT-4?