Features: brand new and high quality USB interface to chassis fan 4pin wire length approx 30cm/11.8in, all copper core wire,durable. Connector form: one end is a computer USB interface, and the other end is a two-wire 4pin chassis fan connector. Please select this cable if you want to use the computer's USB port to supply power to the chassis fan. Please use this cable when you want to DIY the for case fan to modify the notebook cooling pad fan. The chassis fan must support 5V low-voltage startup, that is to say: the USB 5V power can still run, in this for case, the adapter cable can be used. Otherwise, even if there is no problem with the line, the fan will not turn. Specifications: Product Name:USB to 4Pin Cable Product length: approx 30cm/11.8in Wire Type: 2464 22AWG Insulation material: PVC insulation Conductor specification: 17x 0.15TS [Conductor material]: pure copper [Wire outer diameter]: OD3.5mm Rated temperature: 80 [Wire color]: Black Product weight: 10 grams [product interface]: one end of the motherboard 4pin connector, the other end of the USB interface [Product function]: Change the chassis CPU fan to the USB interface for power supply Note: The fan speed will be reduced by 60% when using this USB adapter cable for the for case fan.It is recommended to use a fan with a higher speed when using this adapter cable Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2cm error due to manual measurment. Package includes: 1PC x USB to Molex- 4 Pin Fan Cable