La Crosse Technology WT-3161WH 16" Brushed Metal Atomic Wall Clock

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This unit does not come with batteries.  It requires 1 AA battery. 
 
 

In a nutshell, here's how the the La Crosse clock works: The clock's antenna is specifically tuned for optimal reception of the 60 kHz time signal. The time signal received on the antenna is demodulated by an onboard receiver, which sends the information to the clock's CMOS microprocessor for decoding. Once your clock has automatically set its time for the first time, it ensures continuing accuracy by automatically tuning into the WWVB radio signal once per day after midnight. As long as your clock is kept within transmitter range, it will continue to display the absolutely precise time, even automatically adjusting for summer time/winter time changeovers. Should you move your clock out of transmitter range for an extended period of time, the clock will continue to operate as a highly accurate quartz-controlled clock. Upon re-entering the transmitter range, your clock will correct itself again to the precise WWVB time signal.

The La Crosse Technology WT-3161WH Atomic Clock:
The La Crosse Technology Radio-Controlled Clock maintains its incredible accuracy by automatically tuning into the WWVB radio signal. The built-in antenna ensures reliable signal reception up to 2000 miles (3200km) from the WWVB transmitter. As a result, the La Crosse Technology clock will calibrate to the atomic clock not only throughout the mainland U.S. but also in much of Canada. You need only insert the battery, press the appropriate time zone button, and wait until the signal is received (overnight). In all other locations worldwide, the La Crosse clock can be manually set and will provide the high degree of accuracy of any quality quartz clock.

WWVB (the station identification just like any other radio station) continuously broadcasts time and frequency signals at 60 kHz. The carrier frequency provides a stable frequency reference traceable to the national standard. There are no voice announcements on the station, but a time code is synchronized with the 60 kHz carrier and is broadcast continuously at a rate of 1 bit per second using pulse width modulation. The time code contains the year, day of year, hour, minute, second, and flags that indicate the status of Daylight Saving Time, leap years, and leap seconds.

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Features:
Accurate to 1second per million years
Sets automatically to WWVB radio signal
Pushbutton selection of all four U.S. mainland time zones
Automatically adjusts for daylight savings time
Manual time-set capability for use anywhere outside the WWVB signal range
White face, bold, modern numerals and hands in black, and a surround of brushed steel that fits flush to the wall 
Low battery indication via 2-second steps of second hand
Powered by one AA alkaline battery, with normal life of over 1 year
Dimensions:
Diameter:
16 inches overall
Depth:
2 inches
Radio-controlled Time:
The NIST (National Institute of Standards and Technology, Time and Frequency Division) maintains a radio station, WWVB, in Ft. Collins, Colorado. The WWVB radio station derives its signal from the NIST atomic clock in Boulder, Colorado. A team of atomic physicists is continually measuring every second of every day, to an accuracy of ten billionths of a second per day. These physicists have created an international standard, measuring a second as 9,192,631,770 vibrations of a Cesium-133 atom in a vacuum.

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The La Crosse WT-3161WH Wall Clock has a white dial, large modern numerals, and wide black hands for easy viewing. Overall diameter is 16 inches. The clock has a brushed steel surround for a cool, modern look. 
 
 

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The La Crosse Technology WT-3161WH calibrate's itself to the world's most accurate clock every night by receiving WWVB radio transmissions. These transmissions contain time information from the U.S. atomic clock source, operated by the U.S. Commerce Department near Boulder, Colorado. The built-in antenna ensures reliable signal reception up to 2000 miles (3200km) from the WWVB transmitter. 
 

La Crosse Technology WT-3161WH
16" Brushed Metal Atomic Wall Clock