The Barix Annuncicom PS1 is a desktop or wall-mount IP intercom and paging station with an integrated 1 W RMS speaker, omnidirectional electret microphone, two status-button controls, and an external volume control. It supports headphone and gooseneck microphone connections, 10/100 Mbps Ethernet with 802.3af PoE, and TCP/IP, UDP, RTP, SIP, DHCP, and multicast protocols. Audio formats include MP3, 16-bit PCM, G.711, and G.722.