I'm sure the adidas device isn't compatible as most wearables operate through an app. Fitbit does work with The 1520, and there is a Fitbit app. The latest update to the Fitbit app is pretty good. At present, you won't get notifications on a compatible Fitbit, but we are told, it is on its way.
I've just had a browse on the web and no page shows adidas as compatible with Windows Mobile. Garmin, Fitbit, and Microsoft Band are good to go. I'm sure there were a couple more, but they escape me at the moment