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I've been trying to find one of these cables for a long time. I've never found one before for a price that I really liked (i.e. as cheap supplied from a reputable web site). The cables that I got worked perfectly with a Google Chromecast Audio and the Edifier speakers I got from Amazon (with an optical in).
Important: This cable won't make something that does not support optical out suddenly do it by magic. Ensure that you have a device that can do optical out otherwise it won't do anything. The cable has no analogue support for a 3.5mm audio jack only digital.
Used this cable to hook the chromecast audio directly into one of the digital optical ports in my Yamaha receiver. Set the receiver to 'audio1', cast some music to it, and crystal clear sound came out. Perfect. :-)