Uni-tec Power Guards protect all electronic circuits from power line transients, spikes of very short duration (of 1 milli sec to 100 micro secs) caused by lightening striking the power line and ON/OFF switching of electrical/ electronic appliances. Uni-tec Power Guard absorbs all such spike, surges & transients. It also eliminates RFI/EMI noises on your power line. Three Color LED Site Monitor provides visual indication of your site. It will guide you for the correctness of the site wiring.