Strap has been shortened. While this does pop together quickly and intuitively, if you want more guidance, there are step-by-step videos of assembly and installation of the OEM crossbars on Youtube so you can follow along. I bought this to replace a Parrot model that I had been using in my car that no longer held its charge (after about a year or so of use) and was too quiet on motorways to hear. My Grandson loves this book. Really like the earbuds are wireless and have custom silicone ear hooks. Will update on if I hear from the company or not which will let you know if they stand by their warranty or not. Everything works perfectly! I also own a pair of PSB M4U 2s. I suffer with arthritis have just had a knee replacement and waiting for the other to be done and have to say these trainers are a godsend! It feels like it I?ll probably be able to wear these in over time and if not, I?ll always have a secure sandal that?s soft and comfy.