The APC C5 10 Outlet Power Filter will protect your high performance audio and video (A/V) system from damaging power surges, spikes and lightning. Protection is guaranteed. Isolated noise filter banks will eliminate EMI/RFI as a source of audio and video signal degradation. Data-line surge protection jack will stop surges traveling over phone and modem or DSL lines. Digital Satellite System, Cable Modem, and CATV Coaxial Cable lines are equally protected.