The butt holder I had for the Fitbit zip fell apart. The first time I used super glue which added several months to the lifespan. But in the end they separated again. I bought it as a replacement and it worked great. Together we will, perfect for Fitbit and close to the original. You can definitely feel the difference between this one and the standard, but it doesn't matter. If your holder falls apart, you can definitely keep using your Fitbit.
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