I love that this is an easy app, so all you need are your smartphone or tablet along with my scale! It's amazing how much more comfortable it makes me feel when using this tool compared with traditional scales. This has been great because of its portability - as soon as we get home from work/travels etc., I use this instead of having to wait until next day!! Thanks Redwert team for making such a wonderful product which helps us out in our daily lives! The only thing about this device would be if there was some way to have it charge faster (this doesn't take too long). But overall, I am very happy with the benefits this brings to both myself AND the people around me who suffer through various pains each day.