Control Company 4115 RADIO-SIGNAL REMOTE THERMOMETER - Manual (Page 13)

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Note: When the temperature falls below the freezing point, the batteries
of outdoor remotes will freeze, lowering their voltage supply and effective
range.
3. The transmission is within range and path is clear of obstacles and
interference. Shorten the distance when necessary.
TRANSMISSION COLLISION
Signals from other radio devices may interfere with those of this product
and cause temporary reception failure. This is normal and does not affect
the general performance of the product. The transmission and reception of
temperature readings will resume once the interference recedes.
NOTE ON °C AND °F
The unit of temperature display is selected on the °C/°F slide switch. Select
°C for Celsius or °F for Fahrenheit.
Note that the remote temperature display on the main unit is dominated
by the selection on the °C/°F slide switch of the main unit. Whatever the
display unit of the remote sensors are, they will be automatically converted
to the chosen one of the main unit.
LOW BATTERY WARNING
When it is time to replace batteries, the respective low-battery indicator will
show up when the respective channel is selected. The battery indicator for
the main unit will be shown on the indoor temperature display.
HOW TO USE THE BENCH STAND OR WALL MOUNTING
The main unit has a retractable bench stand, which when flipped open, can
support the unit on a flat surface. Or, close the stand and mount the unit on
a wall using the recessed screw hole.