This black air purifier is for a large room (approximately 500sq ft.) with a 3-stage filtration system that includes H13 true hepa filter, pre-filter & an activated carbon filter. It's very quiet with 3 adjustable speeds and a sleep mode (<24dB) for the bedroom. It also has an aromatherapy function that you can use with your essential oils. Its compact size (6.3 x 6.3 x 8.9 inches) is a big space saver and makes it easy to move from room to room.