Irritrol's RFS1000-RX Wireless Rain/Freeze Sensor (receiver only) comes from the Irritrol Parts Series. The receiver is the part that connects to your sprinkler clock or timer. 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. Irrirtrol 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.