I purchased this about a year ago and stored it in a closet after using it a few times. I'm selling it because I don't have a chance to use it. The instruction manual is not included, so please check the operating instructions on the internet, etc., before using it. The following is quoted from the IKEA website: <Product Description> NOLLÅTTA Alarm clock, white ¥1,299 The automatic dimming function automatically adjusts the brightness of the clock according to the brightness level of the room. You can also manually adjust the brightness. There are 3 levels of dimming. You can choose the brightness that suits you. Even if the screen is turned off, the alarm function will work. You can choose the time display format (12-hour or 24-hour). The alarm clock runs on the included USB cable. When the USB cable is disconnected, the clock will not light up at all. If batteries are added, the settings are saved, and when the USB cable is reconnected, the clock will resume operation and display the correct time.