9-Volt Battery Computer Memory Saver

Automotive computer memory retaining tool designed to maintain the memory of the on-board vehicle computer (CCU) when the power source (battery) is disconnected.Use of this tool when changing or interrupting the power source prevents loss of certain driveability codes, keyless entry codes, digital radio setting, cellular phone settings and other memory related functions. Prevents loss of radio function on anti-theft radio systems. • Use with 9 volt alkaline battery