[Accurate Readings]: The pool thermometer has a clear LCD display with 12/24 hour display option, providing accurate readings in both Fahrenheit and Celsius. Pool sensor temperature detection range: -40 to +70 (-40 to 158), indoor CPU temperature detection range: -9.9 to +50 (14.2 to 122), records MIN and MAX temperature values. [Wireless Connection]: Wireless range: 433MHz/100m. Wireless swimming pool thermometer can display on the same screen the real-time temperature of the water where the sensor is located and the real-time temperature of the room where the main unit is located. With a one-way connection, you can check temperature readings with the receiver without leaving the room. 1C temperature error, 60m transmission distance. [High Dust and Water Resistance]: Made of durable and high quality material, this swimming pool thermometer features high dust and water resistance, which prevents the LCD screen from fogging up during use and extends its life. [Unique Floating Design]: The connected pool thermometer (cone) floats on the water surface and measures water temperature 100m above water and 60m below water. The measurement data is transmitted to the station by radio and can therefore be read out on the base station or on the transmitter itself. [Multiple Uses]: The wireless pool thermometer is ideal for indoor and outdoor use, including swimming pools, hot tubs, fish ponds, aquariums, baby bathrooms, spas and all other types of places. Note: The thermometer does not contain batteries, you will need to purchase 4 "AAA" 1.5V alkaline batteries separately.