18KHz. Operating Temperature level: -10 ～ 55 ℃. Dimensions: 296x140x130mm. Network Audio Bridge GEN-3101A01 Power Supply: POE. Interaction Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 85dB. Regularity Feedback: 50Hz https://raymondvxwut.mybuzzblog.com/9543659/discover-the-perks-of-using-an-ip-speaker-for-clearer-announcements