What are the functions of the buttons on the 3-button control unit?

What are the functions of the buttons on the 3-button control unit?

Here are the functions of the button on the 3-button control unit.

 - Short press = immediate screen change to rear camera for digital rearview mirror. 2nd short press returns to previous screen.

 - Long press for 15 seconds shuts down the Alienrider M2 Pro Unit.

 - During incoming call, answers call

 - Short press = Take a photo with cameras

 - Long press = Locks video 

 - During phone calls, ends call.

 - Short press =  switch to Alienrider Home Screen

 - Long press for 5 seconds, Toggles touchscreen functionality on / off.