18KHz. Operating Temperature: -10 ～ 50 ℃. Dimensions: 440x300x44mm. Zone Combining Digital Amplifier NBS-2301 Power Supply ： AC 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Interaction Method ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Proportion ：. Mic Input 01: ≥ 65dB,. Mic Input https://royalty-free-music82693.like-blogs.com/29871694/the-duty-of-an-ip-paging-microphone-in-effective-work-environment-interaction