The Irritrol RFS1000-RX Rain/Freeze Receiver is intended for use with multiple controllers. 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. 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.