18KHz. Operating Temperature level: -10 ~ 55 ℃. Dimensions: 296x140x130mm. Network Sound Bridge GEN-3101A01 Power Supply: POE. Communication Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 85dB. Regularity Action: 50Hz https://royalty-free-music82603.blogsidea.com/36207500/boost-your-interaction-with-an-advanced-ip-pa-system-today