18KHz. Operating Temperature: -10 ～ 55 ℃. Measurements: 296x140x130mm. Network Sound Bridge GEN-3101A01 Power Supply: POE. Interaction Procedure: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 85dB. Frequency Response: 50Hz https://prescriptionglasses81236.blog5star.com/30395278/discover-the-benefits-of-using-an-ip-speaker-for-clearer-announcements