... .0, 3.5mm Aux in, USB powered,Class D amplifier, 50% higher power efficiency,Max 2W / Ch,Volume control ... 20kHzSNR: >75 dbTHD: <5% @ 1kHzDimensions: D38*W48*H68mm CablesStereo audio cable: Black, 1.5 m with 3.5 mm ... .5", 4ΩInput impedance: 10 kΩAudio input: Stereo 3.5 mm audio jackPower input: 5V over USB; optional ... 110V/220V power supply Cables Stereo audio cable: Black, 1.5 m with 3.5 mm ...