I have an older stereo receiver that has only RCA connectors for input from aux devices, and wanted to hook up my laptop so that I can play streaming internet radio or MP3s through my living room speakers. This cable does the job, just as advertised. I connected the RCA end to the "phono" input, and the 3.5mm end to my laptop's headphone output jack. This isn't an audiophile application, but it works for me.