American Autowire memory retainer assemblies are an auto-resetting breaker that keeps your clock and tunes active, while still keeping the car from being started with the master disconnect switch off. Master disconnect switches are great for security, but you hate resetting your clock and radio presets every time you turn that switch. Creative car guys used to wire a low-amp fuse jumper to keep the basic systems on when the master disconnect switch was off, but every time you forget to switch it back to on before starting, the car the fuse would pop. These assemblies simply install between the two posts of the master disconnect switch to maintain the circuit for up to 2 amps continuous or 4 amps max load.