18KHz. Running Temperature level: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Communication Method: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 90dB. Frequency Action: 45Hz https://reiduqkdc.madmouseblog.com/10468278/discover-the-conveniences-of-using-an-ip-speaker-for-clearer-announcements