[USB DAC Audio Converter] Converts audio signal from computer or gaming device via USB port to digital optical, coaxial, or analog stereo RCA L/R and 3.5mm headphone output. Can also function as an external sound card. [USB to Optical Coaxial Converter] Supports conversion of USB audio signal to digital optical SPDIF or coaxial output. Compatible with soundbars and optical Bluetooth headphones (5.1 channel not supported; set audio output to PCM or LPCM). [USB to Analog RCA and 3.5mm Headphone Converter] Converts USB audio signal to analog RCA L/R and 3.5mm headphone output. Supports all 3.5mm headphones and 2.0ch speakers. [Plug and Play] No driver required. Connect and use immediately with no external power needed. Compatible with mainstream operating systems. (For Windows or iOS, select the appropriate sound output device.) [Good Compatibility] Works with Windows XP, Mac OS-X, and other major systems. Ideal for connecting headphones via USB DAC for gaming or media playback. Color: Black Material: Metal + Plastic Package Contents: 1 x USB DAC Audio Converter 1 x Cable Note: Only the items listed are included. Lighting and display differences may cause slight color variations. Measurement error allowed within +/- 1-3 cm.