FiiO K5 Docking Headphone Amplifier/DAC, Titanium FiiO K5 Docking Headphone Amplifier/DAC - Power Supply - FiiO 1 Year Limited Warranty Headphone Port: 6.35mm stereo Jack Drive Ability: 16-300 Ohms Volume Control: Via analog potentiometer (incl. power switch) Gain: Low: 0dB Mid: 6dBHigh: 12dB