La Crosse Technology WT-5120U Projection Alarm Clock with Outdoor Temperature Projection alarm clock displays time and temperature onto wall or ceiling Time of day updated via U.S. atomic clock for radio-controlled accuracy Automatic projection focus; manual time-setting option; large LCD Clock requires 2 AA batteries and included AC adapter to operate Measures 5-1/2 by 2 by 3-3/5 inches; 1-year limited warranty