The CyberData InformaCast Enabled Ceiling Speaker is aneconomical Power-over-Ethernet (PoE 802.3af) andVoice-over-IP (VoIP) public address product that receivesInformaCast messages or messaging from a multicastsource. It easily connects to your PoE network with a singleEthernet cable connection. The device's small footprintallows the speaker to be discreetly mounted in your ceilings