This National Geographic weather station has everything you need to monitor the weather with accuracy that will astound your family friends. It comes with a wireless weather/wind sensor that gathers data and sends it to the indoor receiver at distances of up to 300'. Base unit features LCD monitor that displays indoor/outdoor temperature, relative outdoor humidity, heat index, wind speed and wind chill. Also has min/max memory that lets you track temperature readings over time and colorful wind chill/heat index temperature scale for quick reference at a glance. Receiver is 6.75"H x 4"W x 1.5"D. 1-year limited warranty.