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What I really really want is: a fitness tracker that does not look like a watch and can be worn with a normal watch.

I prefer wearing classic watches, surely I cannot be the only one out there with this need?

Do not care about notifications, viewing messages etc. So something that has HR and great sleep tracking.

Is the Alta HR slim enough? https://www.fitbit.com/shop/altahr

To get anything on your wrist slimmer than that you'll have to give up heart rate tracking.

I used to wear a jawbone up3 for this very reason, but it seems like they are discontinued. Someone mentioned the fitbit below but it might be too much to sit next to a normal watch.

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