used w/ Pioneer AVH1440 NEX radio & Android phone. And it fits perfectly it keeps on sliding a little bit though. Man these things work great! Solid product from an intelligent and user-oriented design team. I only wished this came as a stock option for the keyboard instead of a separate purchase. What I wasn?t counting on was how narrow the heel and arch areas are. It turned out exactly the way we envisioned. She ended up turning that one into an anklet, but that also broken. but after wearing i got used to it. This is a great pair to wear indoors, I will tell my friends about them back home.