The ourfresh dry fragrance refills freshen medium sized spaces efficiently and cleanly. Using dry fragrance technology, ourfresh releases the right amount of scent without fragrance overload. They don't contain any acetone or solvents so they 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 also contains a biodegradable additive as well as an odor neutralizer. Each refill comes with a C-Cell alkaline battery so you never run out of power.