The Irritrol RFS1000 Wireless Rain/Freeze Sensor comes from the popular RainSensor Series. This sensor can be used universally with most controller systems. It is both a rain and freeze sensor. It mounts to a rain gutters or elsewhere to monitor precipitation and frost, so as to skip watering times. This sensor can be used universally with most controller systems. Irritrol has made their name as a brand by selling and marketing exclusively to the professional installer, as a result their products are geared to be dependable and durable. Irritrol is now making their products available to you through our website. If you are looking for a product line that will last year in and year out, Irritrol is the brand for you.