18KHz. Running Temperature: -10 ～ 55 ℃. Measurements: 296x140x130mm. Network Audio Bridge GEN-3101A01 Power Supply: POE. Interaction Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 85dB. Regularity Action: 50Hz https://josuewaday.thelateblog.com/30479505/discover-the-benefits-of-using-an-ip-speaker-for-clearer-announcements