Sharper Image OQ234 Instructions Manual page 15

Checking Remote and Indoor Temperatures
The kinetic wave display on the channel icon indicates the status
of reception.
The unit is in searching mode
Temperature readings are
securely registered
No signals
If no readings are received from one particular channel for more
than two minutes, blanks are displayed until further readings are
successfully searched. To enforce an immediate search, press
CHANNEL and MEMORY simultaneously. Of course, no reading
will be shown if no remote unit is assigned to that channel.
The Cable Free ™ Indoor/Outdoor Thermometer is capable of
measuring temperatures within the -58°F (-50°C) and +158°F
(+70°C) range. If the temperature goes above or below these
temperatures, the display will show "HHH" or "LLL."