Monitor an additional area with this add-on wireless sensor that measures ambient temperature and humidity, *, Applications, Home, business, rentals and vacation homes; Basements, garages, and attics; Indoor or outdoor temperature and humidity; Food storage; Sensitive electronics and equipment; Greenhouses; Pet care and more, Features, Add-on wireless temperature and humidity sensor (Add up to 5 sensors to your existing gateway, ), Measures ambient air temperature and humidity, 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 and network router required (not included), Detachable probe to measure temperature of water, soil or air sold separately, Length: 6, 25