With all the bells and whistles, the AIR-4 controller is sure to be a favorite. This smart unit has independent temperature and humidity controls, a photo-sensor that triggers CO2 enrichment only when lights are on, and an additional outlet that will power equipment during the day cycle (when lights are on.) This unit also has the ability to control up to 15 amps of equipment. For a powerful, smart environmental controller, indoor gardeners can not do any better. Unit is rated for 15 amps at 120 volts. Controller carries a three-year warranty.