Faulty compatibility specification

The sound of the headphones is very good and clear for an in-ear model. Unfortunately, the product description is not correct: Although there is "komaptibel with Fire Tablets" specified, the button have the cable when connected to my Kindle Fire HD 7 (bought in 2013), no function, no "play / stop" nor "up / down" be recognized or executed. Too bad! If compatibility should apply only to the latest Kindle Fire models, so one would have expected that Amazon does this also identified. So I returned to the headset, because headphones with good sound I have; it was the key functions that had made the device interesting for me.