Function: This cable is 5V USB port to small 3-pin / 4-pin fan cable with it allows you to power most for case fans by using a USB connection, 3pin or 4pin for case fan power adapter cable both OK, you can turn on/off any for time byConnector: One is USB port, another one is small 3 pin / 4 pin for case fan power adapter cable port.Fan must have a at or below 5V (fans with a will NOT work), 12V fans will be operated at a reduced 5V for silent operation.You can use this line to supply power to the chassis fan by computer's USB port, or DIY the chassis fan to modify the notebook cooling pad fan.Name: 2 way USB to 4Pin lineWire model: 2464 22AWGConductor specification: 17x0.14TSWire outer diameter: OD3.5mmRated temperature: 80Function: Change the chassis CPU fan to USB for power supplyNote:The fan must Have a of or less than 5V (fans with a will not work).The chassis fan uses this USB adapter cable, the fan speed will be reduced by 60%,It is recommended to use a fan with a speed when using this adapter cable.Colour:BlackMaterial:PVCPackage Contents:1 x USB to 4 Pin Adapter Converter CableOnly the above package content, other products are not included.Note: Light reflection 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.