This is right for our system. excellent performance! Avoid if you can. The superman of bike hooks. Charges my Apple Watch, iPhone X and AirPods plus. I am now in my mid-70s and still playing club tennis and local tournaments. So thats my tip. In summary, well build, quality manufacturing and really crispy, no-noise mic thats simple to hookup and use. I have a lot of problems with my feet and it?s critical that I find completely comfortable shoes! Talla perfecta.