10 inches square x 3 inches deep Acctim Radio-Controlled Clock for wall mounting or free standing automatically synchronize with atomic time transmitters to ensure maximum accuracy, often within one second per million years Automatic Accuracy: Constantly updates via radio signal for precise timekeeping. No Manual Adjustment: Automatically adjusts for summer/winter time changes. Range: The UK MSF signal has a range of approximately 1,500 km (937 miles). Weighs 2kg
eBay