Replacement convenience: humanized design facilitates the installation and replacement of spacer, enhance user experience, reduce the inconvenience of patients in daily use. Durable and Reliable:Utilizing resistant materials, the pad exhibits long-term durability, ensuring stable operation and reliability of the inhaler. Universal applicability: The o-shaped interface is compatible with various inhalers, ensuring universal applicability and making it a reliable product of choice on the market. Easy to clean and maintain: the Spacer is designed to be easy to clean and maintain, ensuring easy maintenance of the equipment. Multi-location: due to its lightweight and portability, Spacer can be used in a wide variety of locations, including at home, at work, or when out and about, allowing unrestricted use. The NESSI is a spacer intended for use in the inhalation of medications which are provided by OTC MDIs. The device consists of a translucent housing a back piece and mouth piece or face mask.