When the sensor is placed on the back of the hand, it is difficult to position the patch directly over the sensor. There is glue in the center of the patch so you only have one chance to get it right. There is no raised edge around the center circle as shown in the Amazon ad. If instead you try to apply the patch by first removing one of the outer sections of the back cover, you won't be able to tell if you're centered over the sensor. up and sticks to itself, you have to try to remove the patch to start over and almost pulls out the sensor. This patch design should not have any glue in the middle, but should have a non-stick waterproof membrane. There are better patches on the market than this one.
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