Small compact gauge can be mounted to any 12 volt battery. Utilizes LCD display to indicate percentage of charge remaining while battery is in use. Comes complete with 1 amp charger that plugs into display monitor through DC power jack. System performs automatic shut off function when battery reaches full capacity and maintains battery indefinitely. LCD display also indicates status of charge during charge cycle. Excellent charging and maintenance system for underwater viewing systems or active depth finder users who require faster recovery rates.