This 21 Gal. stainless steel is designed and engineered by Nine Stars the World's first legal patent holder. With its oval shape design, it can fit almost any area, such as kitchen, office, living room, in the laundry room, the bedroom, dorm room or any open space. This durable trashcan uses the most advance sensor technology can be found in all Nine Stars trashcans. As your hand or debris within ten inches and 130° angle from the infrared sensor, the lid will automatically opens. The lid will remain open if debris or hand remains within the range of the infrared sensor. Three seconds after your hand moves away from the lid, it closes automatically. Power lasts up to 6 months in normal daily usage. Required three D-size batteries (not included). Includes a garbage bag ring to keeps the bag hidden from public view for a neat and clean appearance.