The power adapter is welded, but it is micro-usb on the other side which is connected to the charging station, then any -micro-usb charger fits, just connect it to the charging station.
The watch indirectly has an altimeter...
The watch can measure the air pressure and deduce the altitude from it. However, as with all other watches with such a function, this must be calibrated. Since the air pressure varies in the course of weather changes!
any questions ?