For installation in the power lead to depth sounders, GPS, Plotters, radio-telephone, etc. It eliminates interference from energy-hungry alternator or onboard instruments (anchor windlasses, radars, etc) and protects instruments against power discharges, 12 V, 60 watt (5Amp), intervention time 5 nanos, peak power 4500 Amp, dissipated energy 45 joules.