This configuration outputs different noises based on temperature. A temperature below 68 degrees F outputs a long steady low pitched noise, above 71 outputs a long steady high pitched noise, and a temperature between 68 and 71 outputs a low pitched beeping at 500 ms intervals.

In this video, I used my hand (body heat) to increase the temperature read by the sensor.

This sort of temperature input – noise output can be seen in some refrigerators. In that case, the noise serves as a warning that refrigerator temperatures have increased and that the food inside is going to go bad.