Comes with a headphone output for private audio listening. Use of safe and reliable USB B type port, to send high-quality USB cable, without power, plug and play. Enable you to output to the amplifier, an integrated sound card as a computer upgrade products, can be connected to the decoder, be sent back to the best level of sound quality. (5.1 channel is incompatible, please set the audio output to PCM or LPCM) Compatible with both XP and OS-X, For best playback in . Compatible with , , , ,which can be connected your headphones by USB for playing games. HiFi Headphone Amplifier, supports most headphones of high impedance 16-300ohm, signal-to-noise ratio 100Db, + N = 0.0003%, fully filter noise, enjoy high-quality audio. Provides the easiest way to convert your PC into a hi-end music server. Join who have already upgraded. Once you get used to playing CDs from your computer, you'll never want to go back to a traditional port. Input: USB Output: coaxial/optical/3.5mm stereo/R/L System requirements for: 10 8.1/8 7 Vista XP or above , , , Windows2000 Distortion: + N: 0.006% (RL 10 k) : equal 102db Dynamic range: equal 102db Frequency Response: 16 Bit 32k, 44.1k, 48k Earphone Impedance/Output Power: 16ohm/281mW 32ohm/222mW 64ohm/144mW 300ohm/38mW Operating Temperature: 0 to 70 size: 10.6 x 6.6 x 2.6cm Material:ABS colour:black Package Contents: 1 x USB Audio Converter 1 x USB Data Cable Only the above package content, other products are not included. Note: Light 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.