hito Extra Large Atomic Radio Controlled LED Wall Clock (Blue) Clock size: 14.2x 8.5x 1.0 inches. Time size: 2.3x 1.3 inches. NOTE: 12/24 Hr Time SWITCH: During normal time display, press and hold [-] for 2 seconds to alternate between 12Hr time and 24Hr time. Atomic Self-setting Clock: radio-controlled automatic time and date update with Daylight Saving Time (DST). 4 US Time Zones Selectable: PMCE. DST Starts/ Ends Automatically. Multi Function Display: Time(12/24 hr), Date(mm-dd), Day of the week, Indoor Temperature(C/F). Brightness Adjustable (3 options). AC powered (external adaptor, included). Memory function.