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 Method: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Frequency Feedback: 100Hz https://claytonuriym.blog2freedom.com/29975445/discover-the-perks-of-using-an-ip-speaker-for-clearer-announcements