Valcom InformaCast® Compliant IP Horns Enable Live, PreRecorded, Or Ad Hoc Audio Messages To Be Broadcast To Ten People Or Ten Thousand People. Instantly And Economically.. – PoE (802.3af) – No Local Power Required. – Very High-Efficiency Ensures Penetration. – at Lower Energy Consumption. – Weather-Resistant. – L Versions Include Long Line Extender. – Allowing Cabling Up to 1200 Feet. – Talkback Models offer Peer-to-Peer Operation. – Line Output Supports Amplified Speakers. – Optional Wall Volume Controls Available. – Backboxes Available for Some Speakers.