When you've accidentally left on accessories or had a power draining short circuit, PriorityStart saves the day. This automatic computerized on/off switching system monitors your battery level and disconnects the battery when voltage drains below 11.7 volts. When you're ready to start the boat, PriorityStart automatically reconnects the battery when the ignition key, running lights, or other electrical device is turned on. Handles 1000 starting amps. Installs in minutes with three easy steps.