18KHz. Running Temperature level: -10 ～ 50 ℃. Measurements: 440x300x44mm. Area Combining Digital Amplifier NBS-2301 Power Supply ： AC 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Interaction Protocol ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Ratio ：. Mic Input 01: ≥ 65dB,. Mic https://bluetooth-speaker26914.blogrenanda.com/35983749/improve-your-communication-with-an-advanced-ip-pa-system-today