This expansion module is designed to be used with your ESP-ME and ESP-SMTe series irrigation controllers only. This Hot-swappablea, expansion module adds 6-stations to your existing system. which means the it can be installed without powering down the controller. It can be installed in any available slot and is a genuine Rainbird manufactured product. Offering over 4,000 unique irrigation products and holding over 130 patents, Rain Bird owns the patent for the original horizontal action impact drive sprinkler. Rain Bird is committed to the design and manufacture of those products that carry the highest long term value and quality. Rain Bird offers irrigation products for farms, golf courses, sports arenas commercial developments and homes in more than 130 different countries around the world.