It creates resistance during inhalation (and/or exhalation). Turning up resistance progressively strengthens breathing muscles.

Athletes, people with breathing concerns (with medical guidance), and anyone wanting better cardio endurance and breath control.

Better lung capacity, steadier breathing, reduced fatigue, improved oxygen use, helpful after illness or training breaks (if no contraindications).

Read the manual, start with low resistance and short sessions (e.g., 5–10 minutes, 2–3 times daily), gradually increase, warm up and cool down breathing.

Clean the breathing part with mild soap and warm water after use; air-dry. Check seals/parts for wear. Avoid submerging electronics.