ourfreshe is the professional 30-day plug-in air freshener for larger spaces. There are no batteries required and the refills are dry so there's no spills or messy residue. One dispenser covers 250 to 500 sq ft. It works great in waiting rooms, lobbies, conference rooms, hallways, and more. Material(s): Plastic; Color(s): White; Height: 6.68"; Width: 2.71".