This adapter is 5.5x2.1mm 4.0x1.7mm 3.5x1.35mm 2.5x0.7mm male to USB female port Fine workmanship, close , stable transmission, rust. Suitable for any narrow space near the computer, monitors or wall to facilitate cable insertion and unplug. Suitable for most brands of led light, router . With the design of lightweight and size, practical and exquisite. It can also be put into any portable bag and easy to storage or carry out.