Alternator charging design uses current from boat’s alternator to re-charge trolling batteries when main engine is running Charge-on-the-fly circuitry puts additional juice back in your trolling batteries on runs between fishing spots – turns off when the engine stops LED indicators display power-on, charging and check connection Waterproof, shock and vibration-resistant design delivers exceptional durability in harsh, marsh environments Engineered with advanced corrosion protection to withstand the destructive effects of saltwater For use with 12 volt systems with 12V / 6-cell batteries that are flooded/wet cell, maintenance free or starved electrolyte (AGM) only Includes one 6-foot fused input cable and two 6-foot fused output cables FCC compliant