Stepless speed regulation: Stepless knob speed regulation, turn the knob to realize speed regulation.Expand the small 3PIN/4PIN interface of the 4-bit fan to solve the lack of fan interface and centrally handle the fan wire.Manual knob speed regulation, can be turned offPower supply 6Pin interface for power supplySupport intelligent temperature controlScope: Suitable for 12V 3PIN 4PIN fans.Colour: greenMaterial: PCB+plastic+metalPackage Contents:1 x Fan Speed ControllerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.