18KHz. Running Temperature: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Audio Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Communication Procedure: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 90dB. Regularity Response: 45Hz https://chanceotpds.blogstival.com/52451653/the-duty-of-an-ip-paging-microphone-in-effective-work-environment-interaction