What's the function of the product? Our product place the role on display and touch. It can replace your broken screen, such as dead pixels, unresponsive touch and other problems. What's the warranty? Our technicians will test the product before shipment. We also offer a 12 month warranty. However, we are not responsible for damage caused by people. What should I pay attention to when installing? a. Please test the product before installation. b. The screen is fragile, please do not press hard. c. Do not overtighten the screws.