Real-time audio stream Playback from SD Card audio files Audio Protocol MP3, G.711a/u, G.722 Two-way talk between remote computer and horn speaker. Network Interface 10/100Mbps RJ45 Max Volume 120db, MicroSD Card up to 32 GB PoE (IEEE 802.3af) maximum 13 W Temperature -40°C to 60°C, Protection Level IP67 Dimension Without bracket: 242 mm × 182 mm × 250 mm, Weight Approx. 1.5kg