Astell&Kern A&norma SR25 MKII Audio accessories

I was sent a different product than the one I had purchased. I had bought a newer mkII version of the Astell&Kern SR25 digital audio player, but I was sent an older version. The external condition seemed good. I did not test the functionality as the product was incorrect. Back Market customer service, on the other hand, has been exemplary, at least so far. I will wait to see how quickly I can get my money back once I return the product..