Off! House/Yard Mosquito Coil Refill 4 Count (6) packages SC Johnson Off! 75203 6 packs Mosquito Coil Refills For Use On Patio & Decks Lasts Up To 4 Hours & Protects Up To 10' x 10' Area For Outdoor Use Only Used in the Off! Mosquito Coil Holder (not included , sold separately)