16KHz. Running Temperature level: 0 ～ 45 ℃. Dimensions: 144 * 144 * 34.1 mm. Network Horn Audio Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Communication Protocol: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Frequency Feedback: 100Hz https://bluetoothspeaker04825.blogscribble.com/30025331/picking-the-right-ip-speaker-key-features-to-take-into-consideration