I bought these glasses from another dealer. (Because not originally available on Amazon) Unfortunately, it has been found that this brand goods billigster China scrap. The build quality is abysmal. The first glasses showed strong ghosting and lack of white lightning suppression on the right lens. See Photo. So back again sent and exchanged for new glasses. The next pair of glasses was missing White lightning suppression on the left lens and flickers between. What shoud that? Something like a completely denatured the 3D enjoyment. That was definitely my last Acer product! Note: The Projaktor is an Acer H7532BD.