1. It is a small "nose-like" piece of plastic with thin filter paper inside. Play function of filting film to prevent particles, bacteria and other pathogens in the air from entering the respiratory system;2. An efficient heat and moisture exchanger to warm and humidify inspired air;3. Designed with oxygen port and sputum suction port.4. Lightweight, Transparent, Low Breathing resistance;5. With 15mm standard connection, easy to connect with the tracheostomy tube.6. Suitable for all ages, adult, children, babies.No usage if the inside package is damagedOutside cartons are easy to be out of shape. BUT that will not damage the product. The insde paper-plastic bag is soft but strong enough to protect them. If the inside package is broken or has any holes, PLEASE DON'T USE.Factory information100,000 GMP clean workshopsCE and ISO certificatedSuggested tidal volume: 100-10mlWater lo (humidification rate): 9.2mg/L (tidal volume is 0ml)Resistance: ≤20pa (flow rate is 30L/min)Interface: 15mm standard cone interfacePackage includes:1pc