Marathon’s Jumbo Atomic Wall Clock with Auto Backlight features a jumbo display for easy viewing and a full calendar display, convenient for planning and organization. This clock has been designed with absolute simplicity in mind, featuring self-setting and self-adjusting functions with easy-to-set slide-switches. The large, easy-to-read display has an ambient light sensor, which triggers a bright yet pleasant backlight at night, while its indoor temperature display, allows you to monitor and regulate your environment for maximum productivity.