180° adjustable projection clock： The Projector Alarm Clock with projection function can project an ultra-clear time onto the wall or ceiling at a distance of 2-3m, and you can freely flip the projection screen upside down. See the time on the wall or ceiling at a glance when you wake up at night, no more turning around to check the time from the clock or smartphone! Multi-function display： The digital clock shows you time, indoor temperature, date, week, month on its display screen, not just an alarm clock. It also supports 12/24H time setting to keep up with your reading habits. White backlight allows you to see the time easily even in the dark night. Battery powered and USB connection： The ceiling projection alarm clock can be powered by 3 AAA batteries (not included) and is designed with a memory function (15 seconds) in battery-powered mode so that you don't need to reset it after replacing the battery. The micro USB port also allows you to connect the clock to PC or power bank