Just plug in the charger and the clock turns on. Disconnect charging and the clock will turn off.
This is a great night clock. They repeat the features of old LCD displays. The clock shows the weather temperature (in degrees Celsius or Fahrenheit) humidity and pressure. Those it is also a weather station. When you tap the screen the clock pronounces the time day of the week and date. You can adjust the brightness of the screen. This will make the clock truly nightly. The watch emits the sound of old electronics when pressed.