Excellent adhesion. This works better if you have someone else. If you put it on yourself I recommend using a mirror and if you can't use a bathroom mirror use a mirror on your phone. It's also easier to use if you fold the patch in half to reveal the blue tabs before applying. However, it is important that you leave the outer cover in place until the patch is over the sensor. I take off one of the bottom white pieces as well as the middle one before putting it on the sensor, leaving the other short piece on top so you can easily remove it once it's in place, then removed the 2 pieces that are blue tabs . The patch usually lasts as long as I have the sensor turned on. It does an excellent job of keeping the sensor dry and clean.
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