The Fusion Controller is the latest addition to our line of fan controllers, and its the most sophisticated yet. A built-in microprocessor continuously monitors and adjusts both inlet and exhaust fan speeds to maintain your desired temperature- the precise running speed for the fans can be set by turning either or both knobs. You can also manually set a minimum or maximum operating temperature by turning either knob until you hear a click; this feature is great for customizing your ideal extraction rates. Each controller comes with a heavy duty cord that plugs directly into its designated outlet. Features Electronic multiple fan speed controller Temperature controlled Completely silent fan speed operation Zero humming from fans Highly accurate temperature control Easy to operate automatic and manual settings 5m NTC Temperature Sensor 5 Step fan speed control Product not normally stocked within the store please allow up to 1 week for delivery.