[Flexible Projection Clock] The alarm clock with projector (rotatable from -90 to 90) has 3 levels of adjustable projection brightness, according to the desired angle and brightness, extremely clear red light projection time on the wall or ceiling. You can easily see the time. Long press the "projection" button to rotate the projection screen 180. Optimal projection distance: 2-5 m. [Practical Digital Alarm Clock] The LED alarm clock displays time (12/24 hours), humidity and temperature (F/C switchable), ideal for bedside table, desk, bedroom, office, living room or kitchen, simple and elegant. Please remove the protective film from the screen before using it. [USB Powered & Spare Battery] The projection alarm clock must be connected to a power adapter via a USB cable to work. There is also a USB output on the back, which allows you to easily charge the device with LED alarm clock. The spare battery can not power the alarm clock. It is used as a buffer battery, when the power is off, you do not need to reset the time and alarm.