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Have so many bad reviews read that I feel the need to share my positive experience. I do not use the tape with Bluetooth, but with plugs, which has proven to be very reliable.
Use the tape for 8 months. It is the first volume! Without complications, at least until now.
On the subject of water, I can not understand the advice, because that is not waterproof the device, should be self-explanatory (just by the switch button for night mode). There are also pay an extra waterproof tracker, which you can swim.
Have the tracker gifted and am absolutely happy with it. The app is absolutely great and clear. Already have some other seen and not seen any better. One can also form a team with friends (I've done with my girlfriend, as this has stopped smoking and were thus motivated to move in order not to increase).
Occasionally hooked syncing, but this is usually fixed with a re-plugging.
There is only one drawback for me. Replacement caps are not quite so easy to get. I myself have not lost my, but my girlfriend. She has ordered two caps, but somehow go lost on the way from the United States (2 times already).
But in general I can absolutely recommend the Jawbone tracker !!!