Say goodbye to your old-school storm glass, wind vanes, and anemometers, and say hello to the AcuRite Iris (5-in-1) Wireless Home Weather Station! More advanced than a basic indoor/outdoor thermometer, the indoor weather gauge display provides you with the indoor and outdoor temperature and humidity, wind speed, wind direction, and rainfall. It also acts as the perfect weather clock, as it provides the time, date, and moon phase. In addition, the indoor weather gauge display provides a hyperlocal forecast 12 hours from your current conditions, which is calculated by using the displays built-in barometer and the data collected by the wireless outdoor sensor in your yard. The outdoor weather station with rain gauge measures conditions and relays the data to the display, so youll know what it is like out in your backyard without even having to go outside! With all your hyperlocal weather data on an easy-to-read display, youll be able to boast to your neighbors that you have the best weather station! The remote weather station uses solar power to regulate internal temperature for more accurate temperature measurements, which can be sent along with the other weather data from up to 330 feet (100 meters) away using a 433 MHz wireless signal. With its auto-dim feature, the best-in-class weather display will look great in your personal weather center or rec room next to your sports ticker with its straightforward readability from almost any angle. The indoor weather station is AC powered and takes three (3) AAA batteries (not included) for optional backup in case of a power outage. The wireless outdoor sensor requires four (4) AA batteries (not included, lithium recommended for optimal performance).