【SAVE YOUR USB PORT】– When your usb port is too little,it will help you to save your usb port. 【ONLY SUPPORT MOUSE AND KEYBOARD】– The usb interface only used to connect mouse or keyboard.It can not connected with other devices. 【MATCHING PROBLEM 】– This adapter can’t fit all the motherboard of different computer.So it have matching problem Only match generic mouse and keyboard 【NEED RIGHT STEP TO USE】– Firstly close your computer .Secondly plug the adapter and connect your mouse or key