Built-in active amplifier. USB bus-powered capability, no adapter required. Conveniently powered via with USB cable. Easily control volume with VOC on the back. Specifications Power output: 3W each (6W total) RMS Input sensitivity: 400mV Distortion: 0.2 %( 1W 1 KHZ) Frequency response: 150Hz-20KHZ Separation: 78dB S/N Ratio: 80dB 3.5mm audio output jack Power Voltage: USB/DC 5V Optional external power supply (DC5V-1.2A) Accessories: USB cable, audio cable Size: 85x85x107mm Weight: 0.55kg
