• High-precision wireless thermometer for pools with high-precision sensors and RF transmission. Data updates once per second with an accuracy of ± 1 ℃. Maximum wireless connection range of 197 feet. • Easy to set up and use. Once the batteries are installed (not included), the device immediately displays the pool temperature. Default unit setting in Fahrenheit, with the option to switch to Celsius. Monitor with large numbers for easy reading from a distance. • Suitable for various applications both indoors and outdoors, including pools, spas, aquariums, fish ponds, and more. • Convenient for knowing the temperature of your pool without needing to go outside. Simply look at the screen to know the water temperature. • Water-resistant with an IP67 rating, works well in rain and snow. • Selectable time display in 12/24H format. • Displays real-time water and room temperature on the same screen. • Records the highest and lowest temperature of the day. • Indoor host temperature detection range: -9.9 ℃ ~ +50 ℃ (14.2 ℉ ~ 122 ℉). • Pool sensor temperature detection range: -40 ℃ ~ +70 ℃ (-40 ℉ ~ 158 ℉). • Temperature error of ±1 ℃ or less, with a transmission distance of 60 m. • Power supply: Indoor main unit and outdoor sensor require 2 "AAA" 1.5V alkaline batteries each (not included). • Includes: 1 indoor main unit, 1 outdoor pool temperature unit, 1 outdoor unit pool tab, and 1 manual.