Terra Trade 72-7118 Solar Powered Window Thermometer Celsius and Fahrenheit display modes, Thermometer measurement range of 32-Degree to 122-Degree Fahrenheit (0-DegreeC to 50-DegreeC) Humidity measurement range from 20-Percent to 99-Percent Powered by Solar Cell and rechargeable LIR2032 battery (included) ON/OFF power switch Suction cup for easy window application, Water resistant, Dimensions: 1.125 by 3.25 by 5.5-Inch