This one gets 4 stars because of the good low price, otherwise I would give 2 or 3. Seems to be working so far, but it took me a while to securely attach it. I was actually ready to return it because I couldn't get it to stay on my daughter's Fitbit, but then I tried it on my Fitbit and it seemed to work. I finally managed to stay on my daughter's Fitbit by forcing the pen's spring return until I felt it click into place. Another issue that worries me is that the pen gets very lost in the tape and I am afraid that the pen will fall out and be lost when the tape comes off. As long as the group stays connected, they can keep my 4 stars.
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