Your product needs almost constant re-calibration. I need to finger stick all day - but you advertise that finger sticking is not needed with this piece of *** It is worthless and you should all be ashamed. Another (small issue) is that the Dexcom app does not communicate to my cell phone - even though I have a Samsung Galaxy which is the most widespread phone on the planet. User's recommendation: Find a reliable alternative and avoid the pretty commercials that they show.