The PriorityStart! 12v Mobility ProMax automatic battery protector is specially designed for mobility applications and replaces the need for dual batteries. If any electrical load has been left on, when the key is turned off, the PriorityStart! Mobility ProMax monitors, detects and automatically disconnects any drain while maintaining starting power and protecting the battery from irreparable damage. Automatically reconnects by operating the headlight switch or operating any installed external switching device, and you start your vehicle. The PriorityStart! Mobility ProMax configuration provides the driver a safety margin of over four minutes to get into the vehicle and be in position to start the vehicle.