This is a cool idea in theory, but the sensors just do not stay on... they will rip out when you take off your bra, after a swim or bath, or just living your daily life and bumping into something. It is a very expensive app to use when you don't have a sensor. they replaced one of mine, but it takes them 3 days to respond and they ask for you to give them all these screenshots and pictures of it still in your body... no... life doesn't work that way... i am not taping this thing to myself after it pulls out while i wait for a response from support and based on their excuses, they don't staff their support desk enough to provide the right response time for the type of info they want... they want screenshots of the error messages that THEIR APP sends... they should have a record of all of that, why burden their paying customers? they also know when the sensors were paired and ask you for that information that is all in THEIR APP. In addition, I had to get bloodwork while wearing it. I was worried something was wrong... i'd had fasting glucose well below 100 all my life, but the signos was showing it 110 or so (every sensor was a little different)... so, it was reading 112, and my blood work clearly showed 89... so the things are not even remotely accurate anyway for all this money. i am a sucker for paying actual money for this.