The Rain Bird IQ4600 is a Stainless Steel Radio Network Cartridge. Network Communication Cartridges upgrade ESP-LXME, ESP-LXMEF, ESP-LXD and ESP-LXIVM Series standalone controllers to IQ satellite controllers capable of being controlled by the IQ Platform. The communication cartridge connects to the back of the controller faceplate and provides the communication link between the IQ central computer and the remote site controllers.