The Saturn? 4 is a basic environmental controller. It's digitally precise with easy to use knob's to dial in your desired temperature and humidity settings. Will operate a CO2 controller, fan, dehumidifier and a night only device to keep your garden flourishing. One button allows you to change between three different operating modes. Comes with a 15 ft remote sensor and a photocell for nighttime control. Enclosure protects internal components from dust, rust and moisture. 15 Amps maximum/120 Volts/60 Hz.