USB drive-free external sound card Restore the sound world of the computer. Three-hole output, with a two-in-one headset + separate headphone jack, which can support two people to use at the same time. Support microphone/sound connection, create a family KTV to be happy at any time, and the voice connection and video chat are more enjoyable. The external volume adjustment knob can freely adjust the volume level, and at the same time add the headphone/microphone mute switch button, which is easy to use and does not disturb the enjoyment of the music feast. It supports two modes of TRS and TRRS, compatible with most headphones, and can convert the analog signal output from the interface of tablet, notebook, desktop, audio, etc. to digital signal output. Product name: USB multi-function external sound card Input interface: USB 2.0 Output connection: microphone interface, headphone interface, 4PIN headset composite interface Signal-to-noise ratio: ≧80dB Headphone Indicator: Blue Microphone indicator: red, lights up when muted Other functions: mute switch, volume adjustment Support system: Windows/Mac OS/Linux Line length: 10cm Material: ABS Colour: Black Package Contents: 1 x Sound Card