BOKANG Flutter Valve Breathing Exercise Device for Lungs, Breathing Trainer, Flutter Valve Device, Mucus Removal, Equipped with 3 Balls and Box, Suit for Lung Rehabilitation Clients and Lung Exerciser

I’m a Register Respiratory Therapist, I bought this for my mother in law. She suffers from bronchitis and is difficult for to clear her secretion and mobilize them so this is a great exercise for your longs. The functionality is great since it helped her cough up all the secretions. I love how you can change the level of vibration accordingly with weights instead of the standard levels in other acapella

We liked how it is easy to use & it has a carrying case but the metal balls are not secure in the case especially the big metal ball. I dropped my case & thankfully it did not break but the metal balls rolled under a chair. We still gave it 5 stars but feel the metal balls need to be more secure.

Been using for about a week. Haven’t noticed a difference yet. Wish there was better customer service , looking how to purchase replacement filters and more info about the different balls included

I have just been using about a week but I feel it is helping bring up phlegm almost immediately after use..I suffer from vocal cord dysfunction and gerd, so have daily need for this, and refused to buy the ones for $75, so far I think it's helping! One tip, be sure small white filter is dry inside, or won't make vibration as should.

Bought this for my mom and her doctor told her it was the best choice!

I like being able to store this breathing device in the box to help keep it clean.Also, having 3 different weighted balls for different breathing capacities which could include children, an adult or an elderly person who may not be as strong with their breathing.Also, you may use an easier (smaller) ball if you had Alott of congestion but as you get stronger or less mucous, you could advance your resistance but changing the size of the ball.

Good quality.

It made my jaw and teeth hurt the next day.