Control Freak Intelligent Fan Controller temperature driven speed control The Control Freak Intelligent Fan Controller could not be easier to use, with its ’Plug & Play’ design and two modes of operation. You can use it as a manual fan speed controller or use an additional 5m temperature probe to operate the unit as a fully automatic speed controller. The probe allows you to use a bespoke software system and gives 50 different speed settings to maintain your grow room. This controller has smooth speed control, giving a more accurate and a quieter operation. The temperature adjustment when using the probe his highly accurate with an adjustment of +/- 1°C