18KHz. Running Temperature: -20 to 50 ° C. Capacities: φ213 x 165mm. Network Wall Surface Mount Audio Speaker GEN-6011A03 Power Supply: DC24V/1A or POE. Communication Method: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Frequency Action: 100Hz https://cesarzbula.spintheblog.com/30360740/why-an-ip-paging-system-is-vital-for-modern-companies