OFF! Mosquito Repellent Coil provides up to four hours of protection from mosquitoes. Works in semi-confined areas such as porches, patios and other areas where there is minimal breeze. The coil works effectively even in areas as large as 10 ft x 10 ft (100 sq. ft), repelling bugs while leaving behind a Country Fresh scent. Help keep mosquitoes at bay, and keep living life your way.