... 0,3.5mm Aux in,USB powered ,Class D amplifier, 50% higher efficiency,Max 2W / Ch,1.5" wideband driver,Volume control,LED ... to present excellent sound quality. Specifications Drivers: 1.5", 4ΩInput impedance: 10 kΩAudio input ... power supply Cables Stereo audio cable: Black, 1.5 m with 3.5 mm audio jack ... (black)Speaker to speaker cable: Black, 1.2 m 2.0 USB powered speakers with Class D amplifier ...