DGZZI 2pcs USB to 4-Pin Molex Fan Power Cable Computer Case Adapter Cord with Switch 12V to 5V Fan Adapter Cable

Some friends want to power the chassis fan with the computer USB interface, please choose this line. Or if you want to DIY the chassis fan to modify the laptop cooling pad fan, please use this line. The chassis fan must support 5V low-voltage start-up, that is: USB 5V power can still operate, in which case the adapter cable can be used. Otherwise, even if there is no problem with the line, the fan will not turn, you must understand this meaning. This line is a 4Pin interface, which can actually be used as a wire, because USB power supply only needs 2 wires, so only two of the wires are used. Note: When the chassis fan is powered by the USB interface, the speed of the fan will be reduced to more than half of the original speed. (Originally 12V, but switching to USB power supply is used to step down, so the speed will become lower)