Celestron HomeCast Weather Station 47021 is a comprehensive weather tool for monitoring changing conditions in up to three different places. Operating with up to three remote sensors with a 100 foot range (one sensor is included), these Celestron weather stations will give you up to the minute data on the phase of the moon, precipitation, and a host of other weather-related factors. Five animated icons tell you at a glance whether it's sunny or raining outside, and the phase of the moon is shown in the bottom right hand corner of the weather station so you can stay on top of the changing month. The Celestron Home Cast Wireless Weather Station also displays temperature trends, humidity, the current temperature (in either Celsius or Fahrenheit), and barometric pressure trends that will help you predict upcoming weather events. Celestron has also included a Comfort Indicator Bar in the HomeCast weather station, a three-color scale that tracks how pleasant it is to be outside. In addition, the HomeCast includes a 12/24 hour clock, a calendar up until 2099, and a snooze-enabled alarm clock. These weather instruments are versatile, too, capable of being mounted on a wall or standing independently on a flat surface, making them perfect for home, office, and anywhere else. With the Celestron Home-Cast Real Time Weather Station, you can know exactly what the weather is and will be before you set foot outside.