Smarthome 1626-10 FilterLinc 10-Amp Plug-In Noise Filter Filters out power line noise that interferes with X10 or INSTEON systems Prevents INSTEON/X10 signals from being absorbed by appliance power supplies Unfiltered feed-through outlet won't block you from plugging in other devices Eliminates interference on the power line, so INSTEON/X10 signals remain strong and clear The 10-amp plug-in noise filter is fully ETL approved Filters out power line noise that interferes with X10 or INSTEON systems Prevents INSTEON/X10 signals from being absorbed by appliance power supplies Unfiltered feed-through outlet won't block you from plugging in other devices Eliminates interference on the power line, so INSTEON/X10 signals remain strong and clear The 10-amp plug-in noise filter is fully ETL approved Total Power Outlets : 2, Operating frequency : 120 Khz