The ourfresh dry fragrance refills freshen medium sized spaces efficiently and cleanly for 30 days. Using dry fragrance technology, ourfresh releases the right amount of scent without fragrance overload. They don't contain any acetone or solvents so it won't leak, break, or leave a sticky residue like aerosols do. Built with sustainability in mind, ourfresh refills are 100% recyclable and are part of Fresh's Eco-Refresh recycling program. Each refill comes with a C-cell alkaline battery so you never run out of power. VOC compliant.