18KHz. Operating Temperature level: -20 to 50 ° C. Dimensions: φ213 x 165mm. Network Wall Surface Mount Speaker GEN-6011A03 Power Supply: DC24V/1A or POE. Interaction Protocol: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Regularity Response: 100Hz https://alexismeuhy.digitollblog.com/29768934/spon-communications-leading-the-way-in-ingenious-ip-pa-system-designs