The worst activity tracker I must say.This is not even worth 2k .And it comes with a price tag of 8.9K .If you want to spend your 9k buying a useless tracker with "NO DISPLAY" then Flex is the product for you.
Everytime you are willing to track your data you have open your phone and then the app and then only you can see the activity.What’s the point of buying a tracker if you have to open the phone everytime.Don’t waste your money buying the flex.