This DAC converter converts digital audio signals to analog L/R audio and can be connected to external devices such as amplifiers by a standard RCA type jack. You can also Choose 3.5mm headphone jack output to connect high-fidelity headphones. With volume knob, you can adjust the volume of RCA L/R + 3.5mm jack audio output, convenient to use. It's perfect for home or professional audio switching. Plug and play, no need to install extra programs. Item Name: Audio Converter Input Interface: for Tos-link, Coaxial Output Interface: R/L RCA, for Tos-link, Coaxial, 3.5mm Signal Sampling Rate: 32-192KHz Bit Rate: 16-24bit Output Impedance: 16-300Ohm Working Voltage: 5V Features: Volume Adjustment, Plug and Play, Digital to Analog Notes: This converter supports digital to analog but ont supports analog to digital. Please set the audio output to the PCM/LPCM format. This converter doesn't support 5.1 channel such as for D-olby and DTS. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Colour: black Material: metal + plastic Size: 81x71x25mm Package Contents: 1 * Audio Converter 1 * USB Power Cable 1 * Optical Cable Only 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.