20KHz. Running Temperature level: -10 ～ 55 ℃. Measurements: 126x66x27mm. Network Digital Amplifier XC-9508P Power Supply: AC100V ～ 240V, 50/60Hz. Power: 130W, 260W, 360W, 500W. Interaction Method: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 80dB. Regularity Feedback: 60Hz https://zanderitagm.nizarblog.com/30119996/transform-your-workplace-atmosphere-with-spon-communications-solutions