A month ago I use this watch, the overall balance is bad. POSITIVE POINTS: nice design, not too big but not for smaller wrists. Autonomy is at least a day, unless to use it a lot. NEGATIVE POINTS: unstable product and impractical to use. The speaker is not enough for the car. Recharging micro usb could have been a cause of standard asset with Android devices, unless it takes a special cable in which the metal part is a little longer than usual (against 7 mm 6): no question use one of your tablet, and if you lose the original cord, good luck to find one another. Furthermore the hatch closing the USB socket is bad practice: we need a pointed object to open it. On the operation of the watch, the bluetooth pairing is easy, but not Android sync (sms notifications), and that is the cross and the banner to resynchronize in case of loss of connection (eg distance) . The screen is too small to navigate, it would have had an administration from the phone. For example, to delete the SMS, it is a ... by a calamitous! And to write, no need to try the buttons on the screen: they are 1 mm side !!! Finally, crashes and bugs are numerous: frozen screen where you have to restart the clock, untimely ringing that will only stop if a call is received ... The plastic strap is a proprietary format, so no matter replaced by a metal or other. All these defects have discouraged me to try other functions (pedometer, ...) CONCLUSION: this watch is not really connected to the point. Barely better than a Chinese gadget for just less than a watch brand. When one wants to play in the big leagues, it takes a bit more, which is not the case here. For me it is too late for the withdrawal, she is now in a drawer where it will come out.