The arm of this digital alarm clock can rotate 90 ° forward and 30 ° backward to obtain a clear time image on the wall or ceiling at a distance of 2.6-9.8 feet. It is easy to read the time even when lying in bed. Touch the projection mode for 2-3 seconds, and the projection image will flip 180 °. The alarm clock with projection on the ceiling has 4 levels of projection brightness to meet your reading needs at different times. 12H/24H format, you can set it according to your habits. In addition to the common alarm function and time display, this alarm clock projected on the ceiling also has date and temperature display. You don't need to open your phone's calendar and weather applications to get information quickly. The digital alarm screen also has 4 levels of brightness, which provides you with the best visual effect and maximum comfort in different times or environments. Connect the USB cable to the projection alarm clock to achieve permanent projection and display lighting. Install 3 AAA batteries for time memory backup. The alarm clock with projection on the ceiling has weekend mode. Once it is turned on, the alarm clock of the rocking bed will not ring on the weekend and will resume on the working day, saving the trouble of resetting the alarm clock. This small and portable projection alarm clock is not only suitable for families and offices, but also a warm gift for children, friends, parents and family.