new and high quality Function: This cable is 5V USB port to large 4pin fan cable with it allows you to power most for case fans by using a USB connection, large 4pin for case fan power adapter cable both OK. Connector: One is USB port, another one is large 4pin 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 large 4Pin line Wire model: 2464 22AWG Conductor specification: 17x0.14TS Wire outer diameter: OD3.5mm Rated temperature: 80 Note: 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. Function: Change the CPU fan of the chassis to a USB interface for power supply and use (When some friends want to use the computer USB interface to power the chassis fan, please select this cable. Or if you want to modify the chassis fan DIY to a laptop cooling pad fan, please use this cable.) Attention: 1. When using this USB adapter cable for the chassis fan, the fan speed will be reduced by 60%. It is recommended to use a fan with a higher speed when using this adapter cable 2. The Computer fan must support 5V low-voltage startup, that is to say, the USB 5V power can still operate, in which case the adapter cable can be used. Otherwise, even if there is no problem with the wires, the fan will not turn. Colour:Black Material:PVC Package Contents: 1 x USB to big 4 Pin Adapter Cable Only 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.