DreamSky Auto Time Set Alarm Clock with Snooze and Dimmer, Charging Station/Phone Charger with Dual USB Port .Auto DST Setting, 4 Time Zone Optional, Battery Backup.Elegant alarm clock with dimmer : 4. 3 Inches large LCD screen display with eye easy catch blue digit , time and content are easy to read at a glance . Adjustable dimmer enable you to set the brightness of display to high, low or off with one button touch . Advance autoset time : The clock will sets itself to the correct time once plug in, hassle free to set time . Cell button battery included as backup battery , which will store the time, date and