[USB Audio Converter] Computer or Game machine Audio Signal Through The USB Port .Covert Audio to Digital Optical, Coaxial or Analog Stereo L/R,3.5mm Headphone Jack .Can Also Be Used As An External Sound Card. [USB to Optical Coaxial Converter]Support you convert the Audio signal for the USB port to the digital optical spdif or coaxial .it could work well with the sound bar and optical bluetooth headphone (5.1 channel is incompatible, please set the audio output to PCM or LPCM) [USB to Analog L/R and 3.5mm headphone Converter]Support convert the Audio signal for the USB port to Analog L/R and 3.5mm headphone.Support all the 3.5MM headphone and the2.0ch speaker. [Plug and Play]No driver required, plug-and-play for instant audio playing and compliant with all mainstream operating systems. no external power required.( or ios system need to choose the right sound card) [Good Compatibility]Compatible with both XP and OS-X, For best playback in .which can be connected your headphones by USB for playing games. Colour: Black Material: Metal+Plastic Package Contents: 2 x USB Audio Converter 2 x cable Only 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.