... system includes power on, overheat, short circuit and overload.Features* Class-D power amplifier for voice evacuation system* 120W, 240W, 350W ... AC PowerPower220V AC, ±10%, 50/60HzMax Working Current0.7A, 1.4A, 2A, 3A, 1.4A, 2.8A, 4A, 6A, 2.8A, 5 ... 72A, 100A Audio Input (balance) Distortion <1% (RMS) , 1KHzFrequency 40Hz~20KHz Audio Output (balance) Distortion <1% (RMS) , 1KHzNoise Ratio ≥85dB Channel ...