The glasses could be used directly and did not need to be charged before. Even after 5 different 3D movies the glasses had not been a single time to be recharged. The 3D image and the effects are just awesome. I am very pleasantly surprised. I have not tested comparatively expensive glasses, whatever it is, however, that I can not imagine that the picture could still be better in some way. In the cinema I often have the problem that I get slight headache after about an hour and my eyes hurt a bit. This problem I have not with these glasses on my projector. Also, two 3D films are not a problem after the other. My family and friends are also very excited.
In a nutshell: I have ordered my 3 more of these glasses and am absolutely thrilled ...