Why is there 2 extra different size steal balls in box

You start with the small ball, then as you can breath easier progress up to the large ball to clear your lungs.

How does it have walnut on allergen list

This should not bother you as you are only normal breathing it's like blowing in a tube.

I can't open it to clean it, it is very stiff. Any ideas?

Mine opens easily so I’d send it back

Does this make you cough more?

If you have mucus in your lungs and use the gadget as directed, coughing will help to remove it. I have also had a great improvement in my breathing after suffering from nasal mucus for years

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💨 Elevate your breath game — clear lungs, clear mind!

BREATHE FREELY LIVE FULLY - Harness trusted OPEP therapy to open airways and clear mucus effortlessly at home.
ZERO HASSLE ZERO BATTERIES - Completely manual design means no charging or batteries—just grab and breathe better instantly.
POLLUTANT DETOX FOR YOUR LUNGS - Daily use helps expel harmful pollutants, promoting cleaner, healthier lungs.
VIBRATION POWERED MUCUS RELIEF - Oscillating pressure technology vibrates your chest to dislodge stubborn mucus for clearer breathing.
STRENGTHEN YOUR RESPIRATORY MUSCLES - Regular training with this device builds lung muscle strength for lasting respiratory health.

The Aobbiy Lung Expansion Device uses clinically recognized Oscillating Positive Expiratory Pressure (OPEP) therapy to help open airways and remove mucus effectively. Its manual, battery-free design vibrates the chest to loosen mucus and expel pollutants, strengthening lung muscles over time. Lightweight and easy to use, it’s a drug-free respiratory trainer ideal for daily lung health maintenance.