18KHz. Running Temperature: -20 to 50 ° C. Dimensions: φ213 x 165mm. Network Wall Mount Audio Speaker GEN-6011A03 Power Supply: DC24V/1A or POE. Communication Protocol: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Regularity Feedback: 100Hz https://augustddday.ltfblog.com/29311260/improve-your-announcements-with-a-premium-ip-paging-microphone