The K5 PRO is a mini stereo gaming headphone amplifier with microphone, supporting usb Type-C,optical and coaxial digital inputs, 3.5mm headphone jack, and outputs, suitable for most home audio systems.With treble and bass control, it can be used as a preamplifier or volume control for PC/. K5 PRO ensures exquisite muslcallty, accurate and realistic phasing, and reproduction of the sound!Input : USB Type-C, Optical, Coaxial, MicrophoneOutput : 3.5mm Headphone, PC-USB supports input sampling rate: Up to 24Bit/96kHzOptical/Coaxial supports input sampling rate: Up to 24Bit/192kHz Output Level: 2VPowe Supply:5VPower Input Interface: USB Type-C: Less than 0.003%SNR: ≥110dBFrequency response: 20Hz-20kHz (±3dB)PC-USB support : XP//W8/W10//linuxDistortion: 0.001%;Amp output maximum power: 1000mw/16Ω, 500mw/ 32Ω, 300mw/64Ω, 150mw/128Ω, 80mw/300ΩHeadphone matching impedance: 16-300ΩColour:dark grayMaterial:MetalPackage Contents:1 x Headphone AmplifierOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.