PUREAV ISO SURPRO 10RCPTL 4720J COAX 10FT CORD 300K PFT uses varying power filter levels to isolate and contain power line noise within individual pairs of receptacle banks. It provides the highest-quality protection available from overvoltages, and safeguards your sensitive home entertainment components from power line contamination, known as electromagnetic interference (EMI) and radio frequency interference (RFI).