The attachment is really very simple and completely free of bubbles. Clean the display with the supplied utensils and free of dust, remove foil on screen protector, aligning it with the display, release and press again briefly in the middle. The screen guard then expressed itself on the display, leaving no bubbles. It is best the way to display a white image on the OnePlus One, so that really stands out every speck of dust. The cut-outs fit exactly for the OnePlus One.