Basically the screen protectors are optical film which processed into different dimensions, such as lines, arcs, holes, etc.
That's why there are so many check points during attachment.
Most failure occurs in such a process.
Printing marks on the top of the screen protector and showing the matching marks on the screen through application, the patented technology allows any customers to install their screen protector on the device without professional's assist or assisting tools.
Otherwise, It's not easy to find out when you have attached the screen protector to your devices.
Caused as its transparency, also there is no labeling.
Our purpose is two fold.
First, Everyone can easily attach themselves to the screen protector.
Second, Possibly to make easily sure the purchase history of screen protector.
Through this, It improves device's portability for customers who purchase Apple devices.
See below screenshots and demo video.