This is a nice window fan with good power and not too noisy, adaptable to different window sizes if you need to move it. However, the sliding panels are flimsy and don't move smoothly; the fasteners that are used to clamp the panels in place are cheap and can easily be unscrewed and fall out.  The single knob control works fine but the settings are hard to see; you will end up turning it by click or fan noise to the desired power or direction. Well-packaged in the box.