Progressive Industries EMS-RDS Remote Digital Switch & Display - BlackThis remote digital display and switch lets RV owners monitor their electrical management system from inside the vehicle. It works with Progressive Industries EMS-HW30C and EMS-HW50C surge protectors to show voltage, amperage, frequency, and error codes in real time. The scrolling digital readout makes it simple to check power status at a glance, and it stores previous error codes to help diagnose intermittent electrical issues. The compact unit installs unobtrusively and provides the convenience of monitoring your surge protection without going outside.UPC818811000139Itemweight0.48 poundsProductdimensions3.5 x 7.5 x 3.0 inchesMaterialPlastic