18KHz. Running Temperature level: -10 ～ 55 ℃. Measurements: 296x140x130mm. Network Sound Bridge GEN-3101A01 Power Supply: POE. Communication Method: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 85dB. Frequency Response: 50Hz https://hectorppdum.bloggazzo.com/29395168/streamline-your-news-with-a-premium-ip-paging-microphone