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INVENTORY OF CONTENTS
1) WT-5600 Alarm Clock
2) AC adapter/transformer
3) Instruction manual and warranty card.
ADDITIONAL EQUIPMENT (not included)
1) Two fresh 1.5V AA batteries (optional for alarm clock)
FEATURES OF PROJECTION ALARM
1. Radio-controlled time and date
2. Projection of time
3. LCD light
4. Three modes of date/second display
5. Alarm
ABOUT WWVB (Radio Controlled Time)
The NIST (National Institute of Standards and Technology—Time and Frequency
Division) WWVB radio station is located in Ft. Collins, Colorado, and transmits the exact
time signal continuously throughout the United States at 60 kHz. The signal can be
received up to 2,000 miles away through the internal antenna in the Projection alarm.
However, due to the nature of the Earth’s Ionosphere, reception is very limited during
daylight hours. The Projection alarm will search for a signal every night when reception
is best.
The WWVB radio station receives the time data 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. For more detail, visit http://www.boulder.nist.gov/timefreq.htm.
To listen to the NIST time, call (303)499-7111. This number will connect you to an
automated time, announced at the top of the minute in “Coordinated Universal Time”,
which is also known as Greenwich Mean Time (GMT). This time does not follow
Daylight Saving Time changes. After the top of the minute, a tone will sound for every
second. It is possible that your Projection Alarm may not be exactly on the second due to
the variance in the quartz. However, the clock will adjust the quartz timing over the
course of several days to be very accurate; under .10 seconds per day.