Its compact design, wind-powered delivery, and biodegradable refills make the DoorMate Air Freshening System the perfect eco-friendly solution to your small space odor control problems. Easy, worry-free, battery-free odor control for 30 days. Simply mount and allow F-MATIC’s world-renowned fragrances to waft through the room, all through the power of a swinging door. Available in seven fragrances.