Saves all drive-ability codes and settings changing a vehicle's starter battery.
It also protects codes and settings for clocks, key less entry systems, and so on.
Plugs into vehicle's 12 volt power receptacle.
This is the best way to change out your vehicles battery. All learned data is saved. Saves memory in you vehicle.
Just make sure the 9V battery is new, turn off your door lamp and other lighting system inside your car to off, attach this item to a 9V battery, insert it into cig receptacle, turn the ignition and your ready to replace your battery. Finished in 15 minutes.