Irritrol Pro Max PROMAX-UA Remote Control System For All Controllers. The Irritrol PROMAX-UA Pro Max Remote Control System is designed to eliminate valuable time and energy spent walking back and forth between the controller and the field. It makes light work of system checkouts and service work, providing field personnel with complete control over any irrigation controller. Controllers may be operated remotely from watering zone sites allowing immediate evaluation of the irrigation configuration and performance. Using the hand-held battery operated Pro Max Transmitter from a remote zone location, the operator may turn on a single station or any number of stations with the push of a key.