It is a portable device equipped with a "two-way air valve" in the "cylindrical and conical body", which simulates the positive end-expiratory pressure generated by the "pursed lip breathing technique" to prevent airway collapse. It is coated with polyurethane and waterproof layer to achieve a reduction in pressure, air leakage prevention and minimal nasal mucus absorbing effects. It can reduce obstruction during sleep and the chance of dozing off while driving.