The Pack of 4 Fly Repeller Fans is a set of USB-powered fans designed to keep flies away both indoors and outdoors. Featuring a quiet operation, these black fans are perfect for controlling pests in a discreet manner. These fans are easy to use and efficient in maintaining a pest-free environment. Ideal for use in yards, gardens, and outdoor spaces, these fly repeller fans provide a convenient and effective solution for dealing with pesky insects.