Portta Digital (Optical, Coaxial) to Analog (RCA) Audio Converter Adapter. See here for details: https://amzn.asia/d/9bGy9xZ I used this to convert digital audio (toslink) from my TV to analog and connect it to an external amplifier. I purchased it about 7 years ago and used it for about 2 years before removing it and storing it due to a system change. There were no problems during use, but please consider this a used item.