DC Alternator ChargerCharges Three Trolling Battery LED indicators Red = check connection (by battery) Green = alternator power on Yellow = charging trolling batteries Turns off when engine not in use Low profile extruded aluminum enclosure Waterproof and corrosion resistant design FCC compliant Specifications: Banks: 3 Portable: No Box Dimensions: 5"H x 9"W x 22"L WT: 12 lbs UPC: 029402031801 Owner's Manual (pdf)