SIP ceiling speaker, 16W, PoE+ required, wideband audio, IP multicast scalable, ambient noise adaptive / talkback / secure SIP (TLS, SRTP), add up to three satellite ceiling speakers, SKU #1198. Technical Note: When satellite speakers (up to three), SKU #1198), are connected to SKU #8198, the connected speakers will share the 16W of available audio power.