16KHz. Operating Temperature level: 0 ～ 45 ℃. Dimensions: 144 * 144 * 34.1 mm. Network Horn Audio Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Interaction Procedure: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Frequency Feedback: 100Hz https://cheapprescriptionglasses34209.onzeblog.com/30006082/the-function-of-an-ip-paging-microphone-in-effective-office-communication