Temp Alert Thermometer displays both aquarium water temperature and room temperature, providing reliable protection to monitor high and low temperatures. Temp Alert has two Alert features (Alarm will sound and LED flashes): High Temp Alert Only and Low Temp Alert Only. Preset, audible and LED alarm will go off when temperature drops below 75 degress or rises above 82 degrees. Plus Temp Alert will display the time when temperature drops below 75 degrees F or rises above 82 degrees F.