DEVICE FOR RESPIRATORY CARE : Hetaru is a expiratory muscle trainer and inspiratory muscler trainer. It is supporting respiratory health and efficiency by promoting diaphragmatic (belly) breathing. DESIGNED TO HELP TRAIN LUNGS : Improved oxygen flow and help improve the strength of your lungs and quality of your breathing. WITH REGULAR AND LONG TERM USE : improves lung strength and capacity by improving oxygen uptake to vital organs.and improve emphysema, pulmonary. MONEY BACK GUARANTEE : A Lot of User Choice we know you will too! But if you are not completely satisfied with The HETARU Hand Held Respiratory Muscle Trainer, please reach out to us for a full refund. ATTENTION: See listing and customer insert for best use of device. Some people find it takes days to see or feel results, while others it may help sooner- keep up usage until correct method and results are obtained.