It's the only scientifically proven, nontoxic, all-natural area repellent that does not use smoke, flames, butane, fans, sprays, liquids, power, or batteries of any kind! Get the same protection without having to wear topical sprays or lotions. Just one grid will repel mosquitoes and other flying, biting insects for up to 100 hours in an area up to 300 square feet! Designed to hang virtually anywhere, each grid comes in a vapor-proof, resealable bag that preserves efficacy during storage. 5" x 5".