OFF! Mosquito 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. Helps to repel mosquitoes in semi-confined areas such as porches, patios and other areas where there is minimal breeze. OFF! Mosquito Coil will protect an area up to 10 ft x 10 ft. Contains 6 coil refills per pack; Country Fresh scent. Entertain on the patio or just have uninterrupted fun in your backyard with OFF! Mosquito Coil.