The Grow1 Wireless Weather Station + Sensor is the perfect system to help keep track of the temperature and humidity in multiple grow rooms or greenhouses. The station comes with 1 sensor, but can pair with up to 3, each with a wireless range of up to 165 feet. Additional sensors may be purchased separately (product #301015). This weather station displays the date and time, the current moon phase, a weather trend indicator, temperature, humidity, electronic forecast, and the indoor comfort level. It also features an Alarm and Snooze function.