La Crosse Technology s Wireless weather station provides you with precise real-time weather data straight from your own backyard. Monitors the indoor room temperature receives wireless outdoor temperature humidity levels tracks trends and sets customizable alerts from an all-in-one convenient device. View the current heat index and dew point along with current moon phase. Displays time with calendar and indicates when batteries are low. Includes a weather resistant TX141TH-Bv3 remote temperature/humidity sensor to send wireless transmission within 330 feet (100m) in open air directly to your indoor station and detects down -40°F. Battery operated weather station requires 4 AA (not included) batteries. View your backyard weather at your convenience with up to the minute data.