This is a great addition to my newer stainless steel appliances. The fan has a high and low setting, the higher really pulls the heat and cooking vapors away from the cook. Low setting fairly quiet, a little louder as expected on the high. 
Single on/off setting for the dual LED lamps, one on each side.  (Shines more to the outside edges of the stove.)
I added the carbon filter between the fan and the metal grease filters, as I have it as supplied by the factory in the non-vented mode.