Outdoor / Indoor Weather Station. Humidity, Temperature and Weather Forecast. -Shows the temperature and humidity both inside and outside. -Indicates the lunar phase and 7 types of weather forecast. -Wireless sensor that transmits up to 25 meters in open space. -Built-in clock with date and alarm function. -The main unit requires 2 AAA batteries and the outdoor sensor requires 2 AAA batteries. -Article known as a thermometer, hygrometer, temperature meter, outdoor/indoor humidity meter.