Automotive Memory Saver with Built-In Charger Direct wired OBDII Connector plug directly into the vehicles OBDII Port. 12 volt, 4.5 amp hour sealed lead acid battery included inside unit. Power on / power off switch. Green LED indicates connection to circuit. Amber LED indicates when the internal battery is 11.6 volts or lower and requires charging soon. Protected by a 4 amp circuit breaker. Saves all drive-ability codes and settings when disconnecting/changing a vehicle’s starter battery. Also protects settings and codes for anti-theft radios, clocks, keyless entry systems, alarms, cellular phone settings, GPS Memory, TPMS, and other memory related functions MS4000 No -