And thats all it says. I just wish the design in the back was better - it should be for the price. I only really use them for a couple hours a day, maybe 4 max, but I havent had to charge them more than about once a week. Thankfully it comes with USB ports. I was looking for a new pair of slippers that dont sound like heels when I wear them on wood floors and I went with these because the description said the soles were rubber. those are mine I the picture. Problem was if you turn at all during the night, you have to be very aware of the position of your head. The sandals are so cute and made of a nice lightweight material. 5 (US womens) and the shoes with full heels I wear a 7. Right now I can?t zip it up by myself, I have to get my husband to zip me up.