The Greenwood Unity CV2.1 100mm Ultra Low Energy SMART Humidistat & Timer dMEV Fan is a high-quality extractor fan designed for any room in the home. With a sleek white circular shape and a diameter of 4 inches, this electric-powered fan features smart control style and a built-in timer function. It has an energy efficiency rating of A+, making it not only effective but also environmentally friendly. The fan can be easily mounted on the wall or ceiling, providing efficient ventilation and improving air quality in the room.