Add-on sensor for an existing La Crosse Alerts System Applications Aquariums and Terrariums Rack systems for reptiles or rodents Incubators Residential or commercial use Refrigerators, freezers and food storage for your reptile Sensitive electronics and equipment Indoor / outdoor temperature and humidity (humidity only measured at the sending unit, NOT probe) Features Add-on wireless temperature and humidity sensor with 6 ft. detachable temperature probe to monitor air or soil. (Add up to 5 sensors to your existing gateway.) Measures ambient air temperature and humidity and probe temperature (humidity only measured at the sending unit, NOT probe) Sensor LCD toggles temperature and humidity Wall hanging or free standing weather resistant case Sensor transmits to gateway in 200 ft. range Humidity: 3% to 99% (%RH) and Temperature: -40°F to 140°F 2 "AAA" Alkaline batteries (not included) Internet, network router and Reptile Guardian monitoring system required (not included)