Sigiliventus Smart EC fan Controller is a complete Digital controller for both the SE-A series fans in silenced and non silenced .This digital controller comes with an external thermal provided in the kit .The Sigilventus Smart controller allows for 4 of the SE-A fans to be run via the digital controller  giving both thermostatic and speed control .Once a temperature has been set the fans will ramp up one level of fan speed for every 2 degrees until preset temperature has been achieved .The controller has a lock function to stop you accidentally changing the presets with both an auto and manual function .No separate power supply is required to run the controller as it is powered via the Ec fan that its attached to.