Regarding my old bike racks, I was missing 2 keys. I like them and they will suit our purposes, but it was a little Disappointing to find that they are plastic The kickstand was very easy to install on my kids bike. Its a big help to see my phone when I ride. Tried these on playing on a PS4 and on multiple games and I am very impressed! The heart rate monitoring doesnt change. I just received my pair & I?ve ordered two more pair in different colors. No solo cambia que sea a color, sino también la nitidez y la visibilidad al sol. I would also point out that I have a wider toe box, and it just barely fits. It comes with various sized buds, so my girlfriend with smaller ear canals can use them too.