Yueton LCD Digital Alarm Clock, Low Light Sensor Technology, Light on Backlight When Detect Low Light, Multi-function with Snooze Function, Calendar, Date, Month and Temperature Display (F/C) Real Bigger LCD Screen,Energy Saving,Bold Typeface,Clear and Comfortable Visual Sense Technalogy,Make Sure You Can See Exactly the Time Without Troubling Sleep. Clock doesn't light up in the day time or room is bright enough. When room's dark, sensor light enables clock to automatically give off soft lights, which is perfect at night; Sensor light can also be close, and please simply press SNOOZE/LIGHT when you're in need. Four Steps crescendo alarm, Ascending "beeping" alarm for gentle wake; Snooze repeats every 5 minutes (Press the Snooze button) Large LCD displays time (12/24),calendar (MM/DD), temperature, alarm status (ON/OFF) . Power Source:3 AAA Battery(Not included).Notice:No Radio Function