If you've been installing Rain Bird's proven time-based controller, the ESP-Modular, you're already one step ahead. It's easy to convert your customers' existing Rain Bird® ESP-Modular Controllers to the ESP-SMT Smart Control System. Simply remove the ESP-Modular panel from the wall-mounted chassis and replace it with the ESP-SMT controller panel. With identical dimensions and wiring, it's just that simple to grow your business by offering Smart Control to your existing customer base.