So, I’ve had my other foot scrubber/ callous remover for years…maybe 20 years and I saw this and thought it was probably time for a new one. Wow, was this an upgrade.First, it’s rechargeable (my old one had batteries), and it conveniently tells you the charge percentage on the display.Second, it comes with the charging cable and an extra grinding head.Third, it has two speeds - which was new to me…my old one had one sped, and as it turned out that one speed was probably too much. Both the low and high speeds are way gentler than my old one. Also, even being gentler, both speeds did just as much work as my old one….it took me maybe 3-5 minutes a foot to get all the hard or dead skin off, and they were smooth. I do like that his one has a feature that if you push too hard, it will stop….so it helps prevent you from grinding off too much of your skin or having it feel a little burnt (I have done this with my other one).I used about 2-3% of the battery using it for about 10 minutes.Very happy with this!