18KHz. Running Temperature: -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. Frequency Reaction: 100Hz https://best-bluetooth-speaker48523.blogdiloz.com/29338518/discover-the-perks-of-using-an-ip-speaker-for-clearer-announcements