Usage Tips:[USB DAC Audio Converter] fer The Computer's Audio Signal Through The USB Port, Covert Audio to Optical, Coaxial, 3.5mm or 6.3mm Headphone Jack.Can Also Be Used As An External Sound Card.(Note:5.1 Channel Is Incompatible, Please Set The Audio Output to PCM or LPCM) [16-300 Ohm Hi-Fi Headphone Amplifier ]Supports Most Headphones of High Impedance 16-300 ohm, Signal-to-noise Ratio more than 100Db, THD + N = 0.0003%, Fully Filter Noise, Enjoy High-quality Audio. [USB Input Volume Control for Headphone Sound]USB inputs,With the Volume Control Knob That You Could Adjust the headphones Volume , [Good Compatibility]Compatible with both Windows and Mac System, For best playback in Windows.Compatible with PS4, PS3, Xbox 360, Xbox One S,Which Can Be Connected Your Headphones by USB DAC for Playing Games. [Plug and Play]No Driver Required, Plug-and-play for Instant Audio playing and Compliant with All Mainstream Operation Systems. No External Power Required Provides The Easiest Way to Convert Your PC into A Hi-end Music Server.Colour: black Material: plastic Size: 106x66x25.5mmPackage Contents: 1 * audio converter(The silk screen is slightly different from the factory) 1 * 3.5mm adapter 1 * USB cable 1 * English Instruction manualOnly the above package content, other products are not included. Note: Light shooting 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.