You can safely open and close your window manually by sticking the Pimapen lock on the non-opening side of the window. Use : Make sure the floor you are going to paste is clean and dry. Remove the adhesive paper at the bottom and stick it on the unopened side of the window by pressing it at a height that your child cannot reach. You can open and close the lock manually with the club. Do not use for 24 hours for full adhesion.