Works great
I bought the Ulla Smart Hydration light for my elderly mom.  She has had so many kidney infections due to her lack of drinking.  This little light has made a world of difference in everything!!!  She feels better and is more active and best of all she hasn't had any UTI's.  I accidentally lost it and had to order another one because she said she missed the reminder every 30 min.  Love it!  Only thing I would recommend is that they make the band more of a highlighted color because it blends in with her water bottles which is how I lost the first one.  I just didn't see it when I threw the bottle away.
Rating: 5 stars