Roof window blinds are attached directly to the glass using suction cups. Drilling is not necessary It can be positioned top, bottom or middle at any height from the window to create optimal sun and privacy protection according to your needs WIDELY USED:Sun shade for windows, balcony doors, sloping roof or patio roof, bedroom, childrens room, office room, hotel room, home cinema or motorhome. You reliably darken the rooms even in daylight It can be attached to any window, and the attachment can be easily removed without leaving any traces Package including: 1 x roller blind 3 x suction cups 3 x Double sided auxiliary sticky pads [instructions for use]: 1. Clean your window glass to ensure that the suction cup can be stably adsorbed on the window 2. Press a suction cup with an alloy rod on one end of the window glass to fix the heat insulation curtain on one side of the window. 3. The other suction cup is adsorbed on one end of the window. When in use, the plastic ring is pulled out and buckled on the suction cup at one end. 4. When you dont want to use the heat insulation curtain, just gently pull the small round particles on the upper side of the suction cup to make the suction cup separate from the glass, and the heat insulation curtain will roll up automatically Tips for installing sucker: Summer high temperature or long time adsorption, placing, extrusion. If the suction cup is deformed or shows signs of falling off, please apply water around the suction cup slightly to strengthen the adsorption fastness. If the suction cup is deformed due to packaging, you can put it in water and iron it to restore the prototype.