ProMariner ProIsoCharge Battery Isolator 120Amp 1-Alt 3-Bat - 12V 23124. 23124 System Volts DC 12 Max DC Amps 120 Amp Alternator Input1 Battery Outputs 3 Size 6.15"(l) x 5.875"(w) x 3.125"(h) Weight3 lbs Significantly Smarter... ProIsoCharge delivers...