All 3M(TM) Versaflo(TM) products are light-weight, compact and well-balanced. QRS (Quick Release Swivel) breathing tubes allow fast and easy connection. Equipped with automatic flow control, low battery alarm, and low flow alarm. Easily removable parts allow simple cleaning, maintenance and replacement. Two-position adjustable airflow feature distributes air where the user wants. The air inlet draws air from the bottom of the unit, allowing the wearer to sit without blocking the airflow