The SMSCom Plug-in Fan Speed Controller is a quality piece of kit that lets you easily adjust the speed of your intake or outlet duct fan with the turn of the knob. You have the choice of a base unit or with the addition of the temperature sensor. Without the temperature sensor the SMSCom Smart Controller acts as a basic manual fan speed controller giving you 60 different speed settings. With the added temperature probe it can act completely independently, keeping your room to user set parameters with a fan speed minimum, making it incredibly easily to give your plants the perfect environment. SMSCom – Very reliable and great value-for-money Plugs straight into a mains socket Wide adjustment fan-speed control Upgradeable with the addition of the plug-in SMSCom thermostat Can supply up to 1500 Watts (6.5 Amps)