Setting Up the Thermometer
Step 1
Remove the battery door, located on the back of the unit.
Step 2
Insert two new AAA batteries in the battery compartment, matching up the batteries' plus and minus signs with the battery compartments.
Step 3
Press the "Reset" button just above the batteries, and then select Celsius or Fahrenheit temperature readouts by sliding the adjacent switch to either "C" or "F."
Step 4
Replace the battery door.
Step 5
Find the "Channel" button above the battery door. Press it repeatedly until you have selected the channel you want your outdoor sensor to operate on (you can have up to three sensors, and each must operate on a different channel).
Setting Up the Outdoor Sensor
Step 1
Remove the battery door on the back of the sensor. Move the "Channel" switch to match the channel you selected on the main thermometer.
Step 2
Insert two new AAA batteries.
Step 3
Press the "Reset" button and replace the battery cover.
Step 4
Place the sensor indoors or outdoors within 100 feet of the main thermometer.