Irritrol Rain Master PROMAX Pro Max Remote Control Set. The Pro Max Remote Control System eliminates lost time and energy roaming between the field and the controller. It makes light work of system inspections and service work, providing field personnel with complete control over any compatible irrigation controller. At nearly a mile away, the operator can activate a single or multiple stations with the push of a button, permitting immediate observation of system operation and performance. The controller access code feature permits independent control of up to 999 controllers with permanent mount receivers.