Zero In 60-Day Citronella Diffuser provides effective control of most flying insects in the home, garden or away from home for up to 60 days. This lightweight and adjustable diffuser is easily portable and perfect for holiday travel or for just carrying out to the garden, as when using the fully opened vents it will cover an area up to 40 cubic square metres. Works well on patios, in gardens, porches, terraces and balconies