Our consumer electronics products include radio-controlled clocks and watches, wireless weather stations, power monitors, and other measuring devices, We introduced radio-controlled clocks to the US market in 1991 and continue to be on the cutting edge of this technology in America, Our weather instruments, clocks and watches are calibrated daily to the atomic time standard of the National Institute of Standards and Technology, Overall diameter of the WT3181P is a full 18 inches (457, 2 mm), and its face is 13, 75 inches (349, 3 mm) in diameter, The big, bold hour numerals are 1-3/16 inches (30, 2 mm) tall for easy viewing from a distance, The analog thermometer has dual concentric temperature scales, One reads from -40 to +130F, and the other reads from -35 to +55C, The analog hygrometer indicates relative humidity from 0 to 100 percent, The clock"s lens is glass for easy cleaning without scratching, and it"s sealed with a rubber gasket to protect the face and hands from moisture, Accurate to 1 second per million years, Sets automatically to WWVB radio signal, Pushbutton selection of all four U, S, mainland time zones, Automatically adjusts for daylight saving time, Manual time-set capability for use anywhere outside the WWVB signal range, Analog thermometer indicates temperatures from -40 to +130F and from -35 to +55C, Analog hygrometer indicates relative humidity from 0 to 100%, Handsomely styled with white face, black hands and dial markings, and pewter-finished metal case, Low-battery indication via 2-second steps of second hand, Powered by one AA (1, 5V) alkaline battery (not included), with normal life of about 1 year, Diameter: 18 inches (457, 2 mm) overall, Depth: 2, 25 inches (57, 2 mm), SKU: LA1019