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 Reaction: 50Hz https://opticians-near-me25790.csublogs.com/36362206/discover-the-conveniences-of-using-an-ip-speaker-for-clearer-announcements