Traceable* Radio Controlled Clock

2¼ in. big digits for visibility from 20 feet. Accuracy is to 1/10,000 of a second. Controlling radio signal from NIST in Colorado automatically adjusts clock to precise time, daylight savings, leap year and leap seconds (earth rotation wobble corrections). Displays time in a.m./p.m. or 24-hour time, month, date, day-of-the-week and ambient temperature in °C and °F (23 to 122°F and -5 to 50°C with 0.5 resolution). Serial numbered Traceable certificate is provided to indicate traceability to standards provided by NIST. Complete with wall mount, screw and 2 AA batteries. Size is 8 3/4 x 9 1/4 x 3/4 in. (W x H x D).