Increase the life of your battery with a battery monitor - the Smart Protector automatically disconnects loads when the voltage drops below the limit value (10.5 V or 21 V) and reconnects them when 12 V or 24 V is reached again. Reverse polarity protected, protection against overload/short circuit/ignition. With main switch. Function control by 2 LED's. Aluminium housing. For vehicles with more consumers and voltage converters.