-Large 10-inch diameter horn-Fully adjustable mounting hardware included-Quick and easy installation-SIP compliant-PoE powered class 3, <13 Watts-Paging prioritization-Plays audio from standard multicast sources-SIP endpoint or multicast group member-Red call status LED indicator-Automatic Noise Canceling ANC feature for operation in noisy environments-Compatible with Polycom multicast paging-Built-in high-efficiency 6 Watt class D amplifier-SIP/Multicast: SIP page, SIP page and zoned multicast receive-Support for access code to prevent unwanted SIP calls-Hangs up on: busy signal, time-out, or touch tone command-Network remote speaker volume control-Programmable pre-page alert tone