1. The bedside alarm clock has dual power supply and a memory function. It can be seen that three AAA batteries can be used independently (the LED screen consumes power and the batteries need to be replaced frequently), and the data cable can also be used independently (it has no storage function). When you use both the USB cable and the batteries at the same time, the main function of the batteries is to remember the time. When using the batteries alone, to save power, we have also designed a sleep function. The screen will automatically turn on when there is sound.
2. The brightness can be adjusted. You can set the automatic mode (night mode) according to your own schedule. Whether it is during the day or at night, you can clearly see the time.