Zero In 60 Day Citronella Diffuser with an attractive adjustable release unit that lasts up to 60 days. Enjoy a pleasant citronella fragrance. It is easy to twist to open and close, making it portable and ideal for holiday travel. This diffuser can be used both indoors and outdoors and covers up to 40 cubic meters. It is designed to kill and help control most flying insects, making it ideal for patios, kitchens, porches, terraces, balconies, and more.