The SMSCom Plug-in Smart Fan Speed Controller is a magnificent piece of equipment which allows you to adjust the speed of your outlet duct fan or speed of intake with just the turn of a knob. You have the choice of a base unit or with the addition of a temperature sensor. If you use it without the temperature sensor the SMSCom Smart Controller acts as a basic manual fan speed controller, giving you up to 60 various speed settings. With the additional temperature probe it can act independently, keeping your room to user set parameters with a fan speed minimum, making it easy to keep a suitable environment for your plants. What are you waiting for?