USB external sound card - single/dual-hole can be used.Three-hole output can be used simultaneously - headset and headphones can be used simultaneously.Computer connected to microphone - live lectures/video recordings have clearer sound.Computer connected to speakers/headphones - listening to music/watching movies, the sound is more immersive.Stable transmission and pure sound quality - enameled copper wire core, low transmission loss, purer sound quality.Noise reduction chip filters noise - independent sound card chip, stable noise filtering, clearer sound quality.Note:If the computer's external HUB or USB extender is connected to the sound card, there will be insufficient power supply and current sound. This is not a quality problem, but this wiring situation. It is not recommended to buy.Colour:GrayMaterial:Aluminum AlloyPackage Contents:1 * External USB Sound CardOnly 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.