18KHz. Operating Temperature level: -20 to 50 ° C. Capacities: φ213 x 165mm. Network Wall Surface Mount Speaker GEN-6011A03 Power Supply: DC24V/1A or POE. Communication Method: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Regularity Feedback: 100Hz https://franciscolslfb.daneblogger.com/29439093/the-function-of-an-ip-paging-microphone-in-effective-office-communication