Dynex Optical/Coaxial Digital Audio-to-Analog Audio Converter - Black allows you to connect audio devices that only have digital audio outputs to devices that only have analog audio inputs. This converter supports PCM stereo and has both optical and coaxial digital inputs. You can select the type of connection you prefer based on the availability of ports on your devices. To use the converter, simply connect a digital optical or coaxial cable from your audio or video device to the converter, and then connect a stereo audio cable from the converter to your audio device. Once the connections are made, plug the power adapter into an AC wall outlet and turn on the power to the connected devices. You should then be able to hear the audio output from your stereo system.