Have this Kippregler bought especially for my runaway-cat who has made despite Mailout fuse through the window from the dust. So this could not go on. No sooner said than done - this Kippregler I got to the window and soon since the Fellnase sitting desperately before;) even when she jumped on a set in the second stage tilt window, thought this was great and offered no more escape routes! Top! And even for such a low price :)