30W high-fidelity speaker with HD acoustic chamber Supports SIP paging, multicast paging, call waiting with priority override, and more Supports full-band and wide-band audio codecs, including Opus and G.722 1x 3-pin differential line out port Ports include 1x 2-pin switch-in input, 1x alarm-in input, 1x DC24V, 1x network, and 1x USB port; Keys include volume up/down, and reset One 10/100Mbps network port with PoE/PoE+/PoE++