Installation instructions not included. There is a layer of polarizer film on the front of the panel (Under the protective film). If it is blurry after installation, please. Remove the polarizer film. We apply comprehensive quality check and testing before dispatching. This item could be used to r. Which is broken, damaged, cracked or unusable. Waterproof, dustproof, smooth surface. High accuracy, no offset phenomenon, contacts exactly. Sensitivity point into the system. Long life, to meet the harsh operating environment, it could tolerate tens of thousands of hits on the panel.