Compare the temperature currently with the last recorded. Includes a wired outdoor sensor and two AAA batteries for base. An up/down arrow will appear to indicate temperature change Temperature ranges between -20°C (-4°F) and 50°C (122°F). Will scan and display the current temperature every 30 seconds. Features 12/24 hour display, indoor and outdoor temperature display in °C/°F, Hi/Low Temperature in °C/°F values, and ice warning. 0.625" D x 3.75" W x 4.375" H