4-Port Passive Return able TV Splitter Signal Booster/Amplifier With VoIP Telephone Bypass Feature Provides Four output ports  three for TV sets and one for a cable modem or MTA 7 dB gain forward and 7 dB gain return MODEM port provides a connection point for VoIP equipment, so that a power failure will not affect services. Compatible with all standard and digital Cable TV services, including the "Triple Play" phone service. Enables critical apps to not be affected by Power Outages or Amplifer Failures. 5-year warranty.