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 Protocol: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Regularity Action: 100Hz https://donovanlidxr.theblogfairy.com/29477363/spon-communications-leading-the-way-in-innovative-ip-pa-system-designs