The STEM™ Light Trap refills are a people and pet friendly insecticide-free solution to attract and trap pesky flying insects in your home. The soft UV-light attracts fruit flies, mosquitoes, gnats and moths, and it is easy to use and mess free. Physical Form: Solid; Application: Indoor; Pest Type: Flying Insects; Fruit Flies; Gnats; Mosquitos; Moths; Product Packaging: Starter Pack.