Adjustable Exhalation Resistance: The breathing exercise device comes with 3 balls of different sizes to adjust the exhalation resistance, allowing you to gradually increase the intensity of your breathing exercises as your lung capacity improves.Portable Lung trainer: This breath trainer equipped with a hand wrist strap makes it easier to carry. And the travel case offered for better manage accessories and bringing any where.Applicable for: People with Cystic Fibrosis, Asthma, COPD, Bronchiectasis, Atelectasis, Smokers, Other conditions producing retained secretions, People with troubles breathing & Lung complications. Also for Athletes, Swimmers, Deep Sea Divers, Singers, Wind Instrument Musicians.Packaged Included: 1 Mucus remove device; 3 stainless balls (16mm, 18mm, 20mm); 1 Ball bag; 1 hand rope; 1 travel case How to Use: Step 1:Inhale slowly and fully first. Then hold your breath for 1-2seconds. Step 2:Seal the mouthpiece with you lips firmly. Step 3:Exhale deeply and slowly, keep your cheeks tucked in. The exhaling length should be 2 or 3times of the inhaling length. Step 4: Repeat step 2 and 3. Avoid rapid and vigorousbreathing during use. *It is recommended to use it 3 times a day for no more than 10 minutes each time, and continuously for no more than 2 weeks.