The Holman Digital Remote Control is designed to retrofit to any major brand of irrigation controller. This unit has 12 buttons numbered 1 through 12. It also has a red LED light that indicates when the unit is transmitting wireless signals. The remote control receiver is positioned near to the existing irrigation controller. The plastic enclosure of the Receiver is water proof so long as it is positioned vertically with the wiring tail to the bottom. The remote control receiver is powered by 24 volts ac taken from the existing irrigation controller. This means it is safe for the DIY person to do the installation.