18KHz. Running Temperature: -10 ～ 50 ℃. Dimensions: 440x300x44mm. Zone Combining Digital Amplifier NBS-2301 Power Supply ： AIR CONDITIONER 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Communication Procedure ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Proportion ：. Mic Input 01: ≥ 65dB,. Mic https://trevorbvnkq.wssblogs.com/30042079/transform-your-office-atmosphere-with-spon-communications-solutions