Features:  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 a 3.5mm headphone jack output to connect high-fidelity headphones.  With the volume knob, you can adjust the volume of RCA L/R + 3.5mm jack audio output, convenient to use.  It's ideal for home or professional audio switching.  Plug and play, no need to install extra programs.     Specifications:  Item Name: Audio Converter.  Material: Aluminium.  Input Interface: for Toslink, 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 the 5.1 channel such as for Dolby and DTS.  Due to the light and screen setting difference, the item's color may be slightly different from the pictures.     Package Included:  1 x Audio Converter.  1 x USB Power Cable.  1 x Optical Cable.  1 x User Manual