Very good device for monitoring not regular. This tracker is doing its job and is so nice to not feel at the wrist. Unfortunately, there are worries of sync with the Fitbit app on Android. For now I can not get notification of calls and load Fitbit syncs only occasionally. No worries about the synchronization of the PC via the wireless synchronization dongle. I still keep the device, because the concept is good and better than the flex Fitbit. But it is a shame to have such worries for a camera at this price and for such a vital function.