The APC C10BLK 12 Outlet Power Filter will protect your high performance audio and video (A/V) system from damaging power surges, spikes and lightning. Isolated noise filter banks will eliminate EMI/RFI as a source of audio and video signal degradation. Data-line surge protection jacks will stop surges traveling over phone and Ethernet lines. Digital Satellite System, Cable Modem and CATV Coaxial Cable lines are equally protected. Sequenced turn-on and off ensures that connected equipment is powered-up/down in the proper order and with the right amount of delay between the stages. This feature is pre-programmed with a six second delay. This delay feature eliminates transients that can affect connected components, e.g. digital projectors.