Assembling this was a nightmare. Arrived earlier than expected and great fit,very comfortable I really liked the style and quality of this shoe, and happy to find it since it is not on the Vionic website, so I was very disappointed with the fit. I use them when I go for my daily walks and they have great sound and fit nice & snug over my ears. Shure have not skipped a beat on the build quality here. *laughing*)Worth noting on this volume graph? There was essentially no perceived volume at 16kHz. Im going to try soaking these in vinegar to try and neutralize the rust. I included a couple pictures to show how small the charging case is and how small and compact the earbud is compared to another model I purchased on Amazon with the same features and battery life. I returned this shoe. The UE roll app was good until I did an upgrade, after which it was not functioning as it was before.