This unit not only runs off of your boats batteries it also monitors them. It monitors up to four batteries continuously. You can determine what the low-level alarm should be for each individual battery as well as what the high-level alarm is. Whether you have a charger or not, if your battery fails, or something is draining your one of your batteries you will get an alarm. It also works the other way as well, if your Alternator has an issue and producing a voltage too high you will get an alarm.

You can also request an individual battery voltage at anytime or you can request them all via a text message. You also have the capabilities to enable and disable individual batteries being monitored.