... Protection,Alarm Systemdisplay accuracyLED displaydigital frequency meter:0.1HZ,digital power meter:0.1Wdigital voltage meter:0.1V,digital current meter ... °Chumidity20-95% Noise< 50dB within 1 metershore power supply are specially for the ship&Shore power which are able to withstand the harshest ... protection are up to IP55. 60kva 3 phase shore marine power supply and frequency converter