Saves all drivability codes and settings when disconnecting a vehicle"s power (battery.) • Direct wired OBD2 Connector • 12 volt ,4.5 amp hour sealed lead acid battery included inside unit • Power on / power off switch • LED indicates connection to circuit • Protected by a 4 amp circuit breaker • Includes 120V AC charger Also protects settings and codes for anti-theft radios, clocks, keyless entry systems, alarms , cellular phone settings and other memory related functions