[Bi-Directional Digital Audio Converter]Convert SPDIF signals of different transmission methods. Optical to Coaxial & Optical, or Coaxial to Coaxial & Optical, just a switch button for your input selection.[Multiple Audio Formats]Audio Input & Output Support audio format: LPCM/ DTS/ DOLBY-AC3. And the highest support 192 KHZ sampling rate. Noise-free transmission, high definition audio output for your amplifier and speaker.[Pure Audio Signal]During the format conversion process of the audio signal, it will't cause loss and interference, which will affect the quality of the audio signal.[Non-destructive extension]Built-in Amplifier for long distance signal transmission. Use optical fiber cable loss less the 0.2Db/m, optical Output distance is up to 30 Meters(98 Feet), Use the standard coaxial cable output can be up to 10 meters (32 Feet).[Plug and Play]no need any software and drive. It's able to power this Optical to Coax Converter from Phone Adapter and a USB jack on the TV or nearby USB port deviceHow to use Audio Converter function:Digital audio converter has two input modes: coaxial and optical. Please connect the audio signaloutput port of TV or projection or other signal source to the input port of the audio converterwith a cable, and connect the output port of the converter to the audio equipment with acable. Select the corresponding working mode. Connect the USB power cable to a device witha USB port or a 5V power adapter.Weight: 80gcolour: whiteMaterial: ABS + metalsize: 54 x 54 x 23.5mmPackage Contents:2 x Converter2 x USB Cable2 x User Manual(Note that the coaxial cable must use a standard cable, otherwise external interference will beattached to the digital audio signal.)Note the TV or projector can't automatically output audio signals, we need to set the TV or speculative audio output to external audio mode or SPDIF mode or COAXIAL mode or TOSLINK mode or OPTICAL mode. (different devices have different names, The specific one depends on the application)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.