All sun EM275B Car Data Saver Automotive Memory Keeper

Normally, when you change a car's storage battery, the car's on-board computer will be turned off and the relevant data and personal settings (such as radio station setting, clock setting, etc) will be lost. The Car Data Saver solve it all can be used to keep your car's computer powered while you perform battery change. It needs an additional car or a 12V storage battery as a power supplier and outputs the voltage which it receives to the car. It features surge voltage protection and output short circuit protection. It is a very useful toll for car service.