The first tracker I received was great. Loved that informed me of calls and texts and when to get moving. However, it kept coming off when I slept. It initially tracked my sleep, but after a week, it stopped tracking my sleep. It provided no sleep data
I purchased one for my boys since they were inexpensive and they wanted to track their steps as well. Well, their attention spans are short, so they lost interest quickly.
I used one of theirs hoping it would track my sleep. It didn’t track my sleep at all. I contacted NORTH and they gave trouble shooting tips, yet the tracker still doesn’t record my sleep data! Go figure. I will be upgrading soon and will pay a few extra dollars to get something that works properly. If you purchase one, don’t count on it tracking your sleep, only your steps, calls, text and inactivity.