Included with every ESP-LXD is the ESP-LXD-M50 module, a “double-wide” module which snaps onto two adjacent mounts on the controller backplane. The ESP-LXD-M50 module includes the lugs for attachment of the two-wire path cables. Built in to every ESP-LXD module is Rain Bird’s Flow Smart software for flow management – simply attach one to five SD-210 sensor decoders and flow meters (not included) to the two-wire path, and the controller will do the rest.