Rain Master Promax Remote Kit for Use With Any Mfg Controllers Includes Transmitter Receiver Universal Adapter & Carrying Case. The Pro Max maintenance remote system eliminates lost time and energy roaming between the field and controller. It makes light work of system inspection and service work, providing field personnel with complete control over any compatible irrigation controller. At nearly a mile away, the operator can activate one or more stations with the push of a button, permitting immediate observation of system operation and perfomance. The controller access code feature allows independent control of up to 999 controllers with permanent mount receivers.