Features: 100% brand new and high quality This fan speed controller adopts brand new materials, with low loss and low heat. It is designed for enthusiasts with need for controlling numerous system fans. Capable of expanding one motherboard PWM fan header to support up to four fans. Support PWM function, speed control, satisfy your control needs. Compatible with 3-pin / 4-pin fans (Due to 3 pins no PWM controller, 3-pin fans would run in full speed.) Package Includes: 1 x PWM Fan Controller Specifications: Size: approx 8x4x2cm/3.15x1.57x0.78in Item Type: 5-Port Fan Hub Material: Nylon + Plastic + Metal Color: Black Cable Length: Approx. 40cm/15.55in Voltage: DC 12V Quantity: 1 PC Fan Hub (other accessories demo in the picture is not included) note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you 4.Only 4-pin PWM fans speed can be adjusted by fan controller software. 5.3-pin fan would run in full speed, can not be adjusted when connect.