Easily expand the ESP-LXME or ESP-LX Basic from 12 to 48 stations using these hot swappable expansion modules. These easy-to-install modules snap into one of four bays on the controller chassis. Dynamic Station Numbering eliminates numbering gaps between stations for easy, confusion-free programming. Features: Adds additional stations to Rain Bird ESP-LX Series modular controllers Hot-swappable station expansion modules can be installed without powering down the controller Available in 8 or 12 station models Can be installed in any available slot