La Crosse Technology WIRELESS 433 MHZ WS-7391U - Manual (Page 8)

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is achieved easiest at night), it will display the correct time
(factory setting is Eastern time zone).
PROGRAM MODE
Programming Note: If 20 seconds is allowed to pass during
programming modes, the unit will confirm/set the last information
entered—the display will stop flashing and return to normal time-
date readings
TIME AND DATE
There are two methods by which the time and date can be set:
1) Automatically via WWVB reception (only need to set the
time zone in section III).
This method requires you to do nothing but wait for the signal to
be received, and to select a time zone (default is Eastern Time
Zone). Reception usually takes approximately 6-8 minutes during
optimal conditions. The best conditions for reception is at night,
between midnight and 6:00 am, when there is less atmospheric
interference. To keep your time as accurate as possible, the indoor
weather station conducts a WWVB search every night between
these hours, and overrides any time that has been set manually.
The WWVB tower icon (appearing in the TIME LCD) will flash
when a search is in progress, will remain steady when the signal
has been received, and nothing will be displayed in all other
situations. If the WWVB time has not been received after 10
minutes of battery installation, you may manually set the time or
leave the time function alone (reception will occur regardless).