Lentek MM30C Bite Shield Portable, lightweight biting insect repellent produces a scent that biting insects hate Effective to repel mosquitos, no see-ums, biting flies, and more Each cartridge offers 120 hours of use - 15-foot radius of coverage outdoors 2 cartridges included - clip on belt or place on any flat surface Perfect for indoors or outdoors - can use with ac adapter