G.A.S Enviro Controller 13AMP TOTALEnviro Controller V2 Version 2 new features: Minimum and maximum day and night fan speed settings Calibrate the sensor both temperature and humidity Green LED indication lights the screen and LED s dim automatically, no light source when the unit is dimmed Control every aspect of your grow room environment from one controller with the G. A. S Enviro Controller. Control your grow room temperature and humidity by digitally controlling your fan speeds.