GerÃ't is easy to use and is understood almost by itself. Time can be set to 12 or 24 hour display. A temperature display is also available as well as an automatic backlight which adapts. So if it's getting light in the morning, for example, regulates the backlight down slowly.
To charge the internal battery is needed, however, even a USB LadegerÃ't or hÃ'nge from time to time the PC / Notebook USB port, the alarm clock