Features: Cable length: about 41cm / 16.14inch. Connector: One is for DC 5521 female port, another one is large 4pin power adapter cable port. Please choose this line when some friends want to use the power adapter interface to power the chassis fan. Or use this cable when you want to DIY the for case fan to modify the notebook cooling pad fan. Most of the power fans are 12V voltage, and most of the power adapters in the market are 12V. After plugging in, the fan can run at the original speed. For example, the power supply of the surveillance camera is the 12V interface, which happens to be the DC5521 interface, which can be used when plugged in. This line is a large 4Pin interface, and actually makes 2 lines, because only 2 lines are needed for USB power supply, so only two lines are used. Specifications: Name: DC5521 female to large 4Pin switch line one to two Length: approx. 41cm/16.14in Model: 2464 22AWG Insulation Material: PVC insulation Conductor specification: 17x0.14TS Conductor Material: tinned copper Wire outer diameter: OD 3.5mm Rated temperature: 80 Product interface: D port at both ends is a large 4pin connector, and the other end is a DC5521 female interface Function: Change the chassis fan to the for DC interface for power supply 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. Package includes: 1 x for DC 5521 to Molex 4 Pin Power cable