18KHz. Operating Temperature level: -20 to 50 ° C. Capacities: φ213 x 165mm. Network Wall Surface Mount Audio Speaker GEN-6011A03 Power Supply: DC24V/1A or POE. Interaction Procedure: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Regularity Response: 100Hz https://martinfugpa.theideasblog.com/30450634/why-an-ip-paging-system-is-vital-for-modern-services