The Octenol Mosquito Magnet Outdoor Biting Insect Attractant Refill 3 pack is a small cartridge trap designed to attract and kill mosquitoes. For use with all Mosquito Magnet traps. Specifically formulated for outdoor use, this product is ideal for controlling mosquito populations in your yard or garden. The Mosquito Magnet brand is known for its effectiveness in luring and trapping insects, making this product a reliable choice for pest control in your outdoor spaces. With a pack of 3 cartridges, you can easily replenish your trap to continue protecting your outdoor areas from pesky mosquitoes.