Get you feet ready for flip flops! [SEP] I got this for my younger cousin who kept stealing my as seen on TV version of the callus remover.  She would use it to remove the hard calluses she had from wearing her soccer cleats and I was always left with dead batteries!  I ordered the Calily for her because it is USB rechargeable, and even comes with a USB cord!  However, it does not have the USB wall plug adapter, so you will need to get one or use the same one you use for a smartphone.  She just uses the same plug adapter that she uses for her smart phone.  If the rechargeable battery didn't have her sold, the 2 speed settings and inclusion of a rough and fine grain so she can get her feet in flip flop wearing condition!  She called me to thank me and said it was very easy to use and works well.  She was defiantly a fan of the 2 different rollers!  Overall, it is working great for her and is easier to maintain as the batteries do not need replaced.