Thermostat and Humidistat functions. 2-in-1 remote temperature/hunidity sensor with 5 foot cable. Controls up to 1000 watts of combined temperature and humidity control devices. Great for use with Zoo Med's Repti Fogger Terrarium Humidifer or Habba Mist? Automatic Misting Machine. Nighttime temperature drop feature controlled by photocell. Built in memory stores settings in case of power failure. Controls temperature by turning on heating devices in "HEAT" mode or by turning on cooling devices (e.g. fan) in "COOL" mode. Alarm flashes when temperature or humidity reaches extreme high or low levels. Temperature control range: 50? F to 122? F (10?C to 50?C). Humidity control range: 15% to 95% RH (relative humidity).