Don't hesitate to buy this!!
I bought this for my mom, who is 84! Like most people, especially the elderly, she stays dehydrated. She actually uses this and puts it around her water bottle and her glass of water!!  She loves it and it truly lights up after 30 minutes if it isn't tipped up for you to drink. For us, this has literally been a life saver!!  She is healthy and active but is very tiny and has AFib, so if she doesn't stay well hydrated, it lands her in the ER. I STRONGLY recommend this!!
Rating: 5 stars