Battery Powered Humidity / Temperature Monitor with Magnet Mount and Collapsible Stand Stores and displays High and Low Temperature / Humidity All-Time Records and 24 Hour Records Touchscreen controls allow you to activate a 15 second backlight, switch between Celcius and Fahrenheit, and switch between All-Time and 24 Hour Min/Max Record Temperature Range of -4°F to 158°F (-20° C to 70° C) and Humidity range of 20% to 95% Powered by two AAA batteries (not included)