High-brightness digital tube display; adjustable from 1min to 60min; frequency range: adults 10HZ-60HZ; ultra-quiet design ≤50dB; used for patients with difficulty expelling airway and lung secretions or lung inflammation caused by mucus blockage. By simulating manual chest percussion, it assists postoperative or weak patients in expectorating phlegm externally, promoting airway clearance or improving bronchial drainage.