1. One per day (recommended usage), we provide an extra 10% bonus to prevent users from forgetting to reorder. 2. Ultra-lightweight design, considerate of tracheostomy patients' discomfort. 3. Pleated and Paper-based HME media, increases the surface area for retaining moisture, and offers a more linear increase in resistance compared to foam material. 4. Low Resistance 5. With oxygen tube connector and suction port, and Latex-free.