The Thermacell Technologies THC-MR-PSL is a scent-free and DEET-free mosquito repeller with a compact design for patios and decks. It uses proven fuel-powered technology without an open flame or smoky candles, and includes integrated mat storage. The package contains one Greenery Patio Shield Repeller and 12 hours of refills, including three repellent mats and one fuel cartridge.