Remote LED status indicator
When the remote is powered on, the LED behind the button will flash green. The built-in LiPo battery is
charged every time a 5V power source is connected to the micro-USB connector.
Backup battery is charging
Battery protection
The battery protection in the remote is based on the nominal voltage, as follows:
Battery level 4, fully charged
Battery level 1, beep tone and battery icon flashing
Power on allowed, critical level, beep tone and battery icon flashing
Shutdown voltage, 20 seconds countdown prompt, recharge as soon
as possible