SMS Smart Controller 6.5 Amp This Smart Controller is excellent and lets you adjust the speed of your outlet or intake duct fan easily by turning a knob. You have the choice of a base unit or the addition of a temperature sensor. Without the temperature sensor, Smart Controller acts as a basic manual fan speed controller giving you 60 different speed settings. The added temperature probe can work independently, keeping your room to user-set parameters with a fan speed minimum, making it incredibly easy 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) SMS Smart Controller Probe The SMSCOM smart controller with NTC temperature probe is a simple, accurate, affordable Climate Control solution. The probe and controller are available separately, but when combined, the controller can regulate the fans to maintain a constant temperature in your environment, giving your plants the optimum temperature for vigorous, healthy growth. The probe is 3m long, allowing you to position it wherever required.