I ordered a "BIG KID SIZE 6" in these tevas. I found it easier to pry up the ends of the original black shell with my fingernail instead of the tool it comes with, but use the tool to lift the rest of the shell off. Like I’m the others mine arrive scratched and they looked like they’d been worn! - Very easy to pair via bluetooth. Its really fast and worth the price. The spring response is even better now after use. He loves the hard bottom and full back. Sure, I had to push slightly harder to flip my case closed but I didnt have to take the covers off for them to charge. It still has 75% battery left per the power monitor on my phone. Instructions for use are pretty simple You can increase/decrease volume, forward or reverse tracks, and play/pause.