[USB DAC o Converter] Transfers the computer's o signal through the USB port, converts o 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 o output to PCM or LPCM) [16-300 Ohm Hi-Fi Headphone Amplifier] Supports most headphones with impedance from 16 to 300 ohms, signal-to-noise ratio greater than 100dB, THD+N = 0.0003%, effectively filters noise for high-quality o performance. [USB Input Volume Control for Headphone Sound] Features USB inputs with a volume control knob to adjust headphone volume directly. [Good Compatibility] Compatible with Windows and Mac systems. For best playback experience on Windows. Also compatible with PS4, PS3, 360, and One S, allowing connection of headphones via USB DAC for gaming. [Plug and Play] No driver required. Plug-and-play functionality for instant o playback. Compliant with all mainstream operating systems. No external power supply needed, providing a simple way to upgrade your PC into a high-fidelity music source. Color: Black Material: Plastic Size: 106 x 66 x 25.5 mm Package Contents: 1 x o converter (silk screen may vary slightly from factory production) 1 x 3.5mm adapter 1 x USB cable 1 x English instruction manual Note: Light shooting and different displays may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3 cm.