18KHz. Operating Temperature level: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Audio Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Communication Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 90dB. Frequency Action: 45Hz https://royalty-free-music82693.like-blogs.com/29871694/the-duty-of-an-ip-paging-microphone-in-effective-work-environment-interaction