PoE powered class 3, 13 Watts Paging prioritization Plays audio from multicast SIP endpoint or multicast group member Supports up to 10 multicast paging groups Blue paging status LED indicator SIP compliant see product manual for compatible IP PBX phone systems Autoprovisioning via Viking programming software Built in high efficiency 6 watt class D amplifier SIP /Multicast SIP page, SIP page and zoned multicast stream, zoned multicast receive Support for access code to prevent unwanted SIP calls Line level audio output for connecting to an external amplifier Network remote speaker volume control Can drive additional external analog speakers for greater coverage Mounting Blind mounts into 9.5 hole, clearance requirement of 3.45 87.3mm above 1/2 gypsum board ceiling Heavy duty back box protects speaker and circuitry from plenum dust