18KHz. Running Temperature: -20 ～ 50 ℃. Measurements: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Communication Method: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 90dB. Regularity Action: 45Hz https://juliusybwvo.vblogetin.com/35573240/how-an-ip-paging-system-enhances-emergency-situation-response-in-workplaces