This alarm does not need installation as UseaMy constantly monitors the battery voltage. If the battery voltage drops below 12.1 volts (24.2 volts in a 24 volt system) for more than 10 minutes, the buzzer will first sound a short beep every four seconds for ten minutes, then switch to flashing the navigation lights with a short flash every four seconds. This will continue until either the battery voltage exceeds 12.2 volts, (24.4 volts) or you acknowledge the alarm by pressing the SOS button twice.
The alarm will reoccur if the cause is not rectified.