18KHz. Running Temperature: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Interaction Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 90dB. Regularity Action: 45Hz https://finnbcatk.ampedpages.com/just-how-an-ip-paging-system-enhances-emergency-response-in-workplaces-57290585