Projector clocks are digital atomic clocks that have a built in projector that can be shone on the ceiling, wall or area of your choice for easy viewing. These clocks normally come with a number of options and features including color choice, weather forecast and alarms.
The clocks being atomic mean that if you place them on a wall or shelf where it is not easy to reach then you do not have to worry about changing the time. Atomic clocks automatically update for Daylights Savings Time twice a year. The clocks with weather or temperature features normally have a wireless feature to pick up the weather information for the display.