18KHz. Running Temperature level: -10 ～ 55 ℃. Measurements: 296x140x130mm. Network Sound Bridge GEN-3101A01 Power Supply: POE. Communication Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 85dB. Frequency Response: 50Hz https://speakers80990.blogs100.com/30458973/boost-your-interaction-with-an-advanced-ip-pa-system-today