16KHz. Operating Temperature: 0 ～ 45 ℃. Dimensions: 144 * 144 * 34.1 mm. Network Horn Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Interaction Procedure: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Regularity Response: 100Hz https://bluetoothspeaker94714.bloggazzo.com/29424605/the-function-of-an-ip-paging-microphone-in-effective-work-environment-communication