18KHz. Running Temperature: -10 ～ 55 ℃. Measurements: 296x140x130mm. Network Sound Bridge GEN-3101A01 Power Supply: POE. Interaction Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 85dB. Frequency Action: 50Hz https://surroundsoundsystem44468.theisblog.com/30203745/spon-communications-blazing-a-trail-in-innovative-ip-pa-system-designs