GJD 4-Zone Expansion Unit Designed to work with the GJD DygiZone digital lighting controller and the GJD range of external PIR detectors the advanced 4 Zone Expansion Unit greatly simplifies installation time and cost. The 4-zone expansion unit incorporates an energy efficient switched mode power supply and can control up to four individual lighting circuits each with 1500W resistive load. Additionally, the modular design enables the Expansion Unit to be conveniently installed within easy access to the mains supply. Up to 10 x 4 zone expansion unit can be used on one system.