Welcome to ShenMo shop! SAVE YOUR USB PORT - When your USB port is too small, it will help you save your USB port. ONLY MOUSE MOUSE AND KEYBOARD - The USB interface only used to connect mouse or keyboard. It cannot be connected with other devices. RELEVANT PROBLEM - This adapter can not fit all the different computer motherboard. So it has match problem Only match generic mouse and keyboard NEED TO USE STEP- Firstly, shut down your computer. Second, plug in the adapter and connect your mouse or keyboard. Third, open your computer so you can work. Pls plug in the adapter when your computer not working!! WARRANTY IF DO NOT WORK DIRECTLY REFUND YOU DON'T NEED RETURN- If you find the adapter can't work , you don't need to return the product, we can refund you directly, it's good matching problem. It still can work with other device, just leave it as a spare!! < p>100% satisfaction - Our customers are our priority. If you find any problems with the products after receiving the goods, such as damage and incorrect quantity, please contact us immediately. We do our best to provide you with satisfactory after-sales service.