These are really easy to use and great for picking up cold/hot spots.
Simply leave in the location you want to use it in for about five minutes to allow the sensor to adjust to the room temperature. After the five minutes just turn on the Temp Alarm Pod and it will ready for the night/day investigation.
These are not affected by a slow drop or raise in room temperature.
*Small in size
*Runs off a 9 volt battery
*Different sounds for hot and cold