Wireless Weather Station, Series AcuRite Notos, Power Source (3) AA Alkaline Batteries (Weather Station), (4) AA Alkaline or Lithium Batteries (Sensor), Display Screen Type Color LCD, Data Update Frequency 18 sec, Weather Sensor Type Humidity, Temperature, Wind Speed, Transmission Range 330 ft, Number of Pieces 2 The AcuRite Pro Weather Station with Wind Speed wirelessly measures temperature, humidity, and wind speed, bringing you the information you need to take action in your industry of property management, agriculture, hospitality, or right on the jobsite. The weather station uses patented Self-Calibrating Technology to provide a personalized forecast of 12 to 24-hour weather conditions. Self-Calibrating Forecasting is generated from weather data measured by a sensor on your property. AcuRite's atomic clock maintains the correct time and date with split-second precision, and automatically updates for Daylight Saving Time. The display can stand upright for tabletop use, or can be wall-mounted. The wireless outdoor weather sensor is made up of three integrated sensors: thermometer, hygrometer, and wind speed anemometer.