Bite Shield Portable Mosquito Repellent: * No messy injurious sprays or creams * Up to 15" radius of coverage outdoors and up to 2000 sq. ft. indoor * University tested effective * 2 repellent cartridges included * Operates on 2 AA batteries, not included * Standard AC adapter available for direct plug-in (sold separately) * Perfect for any outdoor activity * Each cartridge offers over 120 hours of use or up to 72 hours constant use