My Velux windows are now 3 year old and have side one type button above under - the blinds can be no problems with the supplied bracket simple pinch. Had imagined the whole complicated and I was very surprised - after 15 minutes of my blind was attached properly. And if you have the Echoed claws also fitted neatly parallel to each other, the fabric sits beautifully taut. The fabric and the upper attachment are of high quality - for the price a very emfehlenswertes product. Those who can not get used to the lateral light slit of 1 cm, I recommend the version with the side rails.