The first one I tried had the adhesive peeling off due to a sticky residue, rendering it unusable. The second one I tried applying didn't apply bubble free for some reason (no dust or other residue) and didn't stick to the Fitbit and the alcohol pad was completely dry. But the third was charm. I'm glad it comes with 4 screen protectors but I don't think you need 3 of them to do a good job. Also, I felt the instructions weren't very clear (for example, the sticker that says "FRONT" is actually the part that's supposed to stick to the front of the Fitbit). There is also a "microfiber cloth" in the installation instructions, and if there is no mention of screen cleaning paper, there is no microfiber cloth included. I've installed screen protectors on many different phones, but this particular screen protector left me frustrated and incompetent.
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