Car alarms with auxiliary battery

Auxiliary battery

— the car alarm has its own autonomous power source, which does not depend on the state of the car's power supply system. Such alarms are considered more reliable as they are more difficult to turn off. It is also possible that the main power is supplied from the electrical system of the car, and the autonomous one is a backup; at the same time, in the event of a power outage, the alarm remains operational and can, at least, send a signal to the owner's key fob.