Patio Shield is easy to use and provides hours of scent-free mess-free defense against mosquitoes. With no batteries or cords needed the Patio Shield is convenient portable mosquito protection ideal for entertaining gardening poolside and more. Features a 15-foot zone of mosquito protection. Powered by a safe and compact 12-hour fuel cartridge.Features: Patio Shield creates a 15-foot zone of protection against mosquitoes. Powered by a safe and compact fuel cartridge. Emits scent-free repellent that drives away mosquitoes. Repel mosquitoes without DEET sprays or lotions on your skin. Enjoy maximum protection in 15 minutes. 12 hours of mosquito repellent and fuel included. Unscented repellent mats last up to 4 hours each and change color when time to replace. Our synthetic allethrin formula is inspired by repellent extracts found in plants. Independently tested and EPA-reviewed for safety & effectiveness. People and pet friendly. Extend warranty to 2 years with registration (automatic 1-year warranty included). See packaging for details. Includes: One repeller one 12-hour fuel cartridge and three 4-hour repellent mats.