-Large 10-inch diameter horn-Fully adjustable mounting hardware included-Quick and easy installation-SIP compliant, see page 2 of the product manual for more information-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-Proprietary VOX switching eliminates the need for Push to Talk mode-Selectable auto-answer feature