This indoor bug zapper is designed for use in warehouses, supermarkets, office buildings, and other non-sensitive areas and is chemical free. It can easily be mounted to a wall, which allows you to conserve valuable space in crowded areas. Although this unit is not recommended for use in food prep areas, it works well for loading docks, entryways, and other areas where pests can be a problem. Featuring a removable plug and stainless steel housing for easy cleaning, this unit provides exceptional bug killing protection over approximately 3000 sq. ft. This coverage area may vary depending on the layout of your room, how often the door is open, how much traffic the area receives, and the number of insects in the area.