Temperature & Time Projection Clock with Light Sensor: Uzoli projection clock features a light sensor that automatically reduces the backlight brightness at night, ensuring that the screen does not disturb your sleep. It clearly project the time and indoor / outdoor temperature on the wall or ceiling in a soft red tone at a distance of 4.92 to 8.2 feet (best at 6.56 feet). The projector's swivel range of 180° providing you with the flexibility to adjust the projection angle for optimal viewing Atomic Radio Clock Projector: The atomic projection clock can search and receive the local WWVB signal to calibrate the time every day automatically or manually, also the alarm clock projection supports the setting of Daylight Saving Time( DST). To ensure the accuracy of the result, please choose the correct time zone for the weather clock according to your location (The backlight will turn off automatically during RCC reception.) Ceiling Projection Clock with Color Display: The weather