The La Crosse Technology Projection Alarm Clock projects the time and/or temperature on your wall or ceiling. It is loaded with other functions, such as projection direction with automatic focus and intensity settings. Projection displays various modes, such as (alternating) outdoor temp & time; outdoor temp only, or time only. Adjustable backlight brightness levels when operating with power adapter. Battery-only operation offers a battery-saving feature that activates display & projection for 10 seconds then shuts off to save power. Keeps time accurate with its self-setting atomic clock and resets automatically for Daylight savings. Also monitors the room's temperature and displays a full calendar. Includes a wireless weather-resistant temperature sensor, which can be placed outdoors to transmit outside temperature to the clock. Also charges a smartphone or mobile device via USB port (charge cable not included) on back and indicates of low battery and temperature trends.