Charging power is probably around 1 amp so expect a slow charge, but does work. Love Love Love these shoes. The laces do not hold your foot in, at least for casual wear. You can either desolder it to remove it, but I do not know if it will break the keyboard or not. Didnt think they would be as comfy as this. Theyre not as gushy as Crocs, but they can be worn for several hours without an issue. my son loves using it to open old school soda bottles :) Overall, great sandals. I made one phone call and other party said there was no wind noise. If you are taller than 57 or have a big butt then these will stop at your ankles. These are easy to put on, which is important when you are undressing and dressing a squirmy boy 3 or 4 times a day in the winter to go outside to play.