There was, of course, no answer to be found. They look great but my daugther says her feet sweat too much in them. This was the only pair that was truly comfortable. So far Ive never run out of battery, but Ive not been on a ride longer than 4 hours yet. Will try again with a different horizontal striped one to see if it’s the same quality as the first one but just FYI the quality differs from product to product. Nice face wash but too expensive for the quantity purchased. It is cut so poorly that there are inches of difference on the bottom from one side to another! Seems heavy and well. I ended up using a short mounting bracket and NO extension (short or long) at all. They have made her life better because she can go more places and walk around the stores and live a more normal life.