18KHz. Running Temperature: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Interaction Procedure: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 90dB. Regularity Action: 45Hz https://communicationssystem15824.activoblog.com/30811337/discover-the-advantages-of-using-an-ip-speaker-for-clearer-announcements