18KHz. Running Temperature level: -10 ～ 50 ℃. Dimensions: 440x300x44mm. Area Mixing Digital Amplifier NBS-2301 Power Supply ： AIR CONDITIONING 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Interaction Method ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Ratio ：. Mic Input 01: ≥ 65dB,. https://cheapprescriptionglasses05826.blogmazing.com/29476783/discover-the-conveniences-of-using-an-ip-speaker-for-clearer-announcements