hito 3.8" Digital Battery Atomic Alarm Clock Bedside Travel Auto Time Set Auto Night light Date Day Indoor Temperature 4 Timezones for Bedroom Office Desk EASY TO SET: 3 simple steps and wait for the correct time to set (for more details, check the Product Description below). Clock size: 3.8" x3.2" x1.0"; Base depth: 1.3. SELF-SETTING W/ 4 TIMEZONES: Atomic clock receives radio time signals from Colorado and updates itself with accurate time and date. 4 timezones (P/ M/ C/ E) selectable. BATTERY OPERATED: hito digital bedside alarm clock works with 2x AA batteries. GLOW IN THE DARK: hito atomic alarm clock features an light sensor which activates soft ambient backlight when it is dark. Make sure to turn the switch on in the battery compartment. INDOOR TEMPERATURE: This clock also displays indoor temperature (Fahrenheit/ Celsius).