It can be used as a preamp or volume control for PC/MacPortable all-in-one decoder and headphone amplifier, suitable for PS4/PS5/Switch desktop active speakersSupports USB Type-C/optical coaxial digital input, 3.5mm headphone and RCA outputSupports headphones with microphone, with high and low volume, independent volume knob, free controlPC-USB operating system support:XP/W7/W8/W10/MAC/linuxModel number :K5PROFrequency response :20Hz-20KHzSNR :Greater than 98dBTerminal impedance :2-8Distortion degree :0.003%Amplifier output power :1000mW/16, 500mW/32300mW/64, 150mW/128, 80mW/300Headphone connection impedance :16-300Audio input interface :Type-C, fiber, coaxial, microphoneSignal output interface :3.5mm earphone /RCAPC-USB operating system support :XP/W7/W8/W10/MAC/linuxPC-USB supports input signal sampling rate: up to 24bit/96kHzFiber/coaxial input sampling rate: up to 24bit/192kHzColour:As ShownMaterial:Aluminum alloySize:11.2x9.5x3cmPackage Contents:1 x Headphone amplifier1 x 3.5mm headphone splitter1 x Two-USB-AC to C cable1 x Optical fiber cable1 x English manualOnly 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.