A UV light mosquito killer is designed to attract and trap flying insects, such as mosquitoes, flies, and gnats. These devices typically use a UV light to draw insects towards them. Some models may then use a fan to pull the insects into a collection tray, while others might use an electric grid to kill them. Many are marketed as a chemical-free alternative to insect repellents and sprays. They are often designed for use indoors or outdoors and can be powered by USB or standard electrical outlets. Features can include quiet operation and easy-to-clean collection trays.