About The Item: Color Hd Display Digital Atomic Clock Digital Atomic Alarm Clocks For Bedrooms With Battery Backup Feature A Large 6-inch Clear Hd Display And Vivid Digits With Wide View Angles. It Has 7 Time Zones: Ast(-4)est(-5)cst(-6)mst(-7)pst(-8)akst(-9)hst(-10). By Setting The Time Zone On The Atomic Alarm Clock And Leaving It Plugged In Overnight, It Will Automatically Sync To The Correct Time During The Night With The Wwvb Function On, While Also Self-updating For Daylight Saving Time (.