" DESIGNED TO HELP BUILD: Our mucus clearing device is also an excellent lung strengthener; with long-term regular use, the breath trainer will have a dramatic effect on your lung strength and breathing quality. CLEARS AIRWAYS: This portable lung exercise device sends vibrations through your airways, effectively loosening stubborn mucus that builds up on the walls of your airways; you can easily clear mucus from your system when you cough. EASY TO USE: This lung exercise device does not require any batteries or rechargeable batteries, making it ideal for long-term breathing issues or recovery aids. QUICK AND EASY: The device is quick and easy to use, requiring only 10 to 30 minutes of practice per day. Will help the following groups: children, adults, seniors, smokers, swimmers and deep sea divers, athletes, singers, wind musicians. USE: This lung capacity exerciser can clear your airways and act as a portable breath trainer, expand your lungs and help loosen mucus, improve your overall health, fitness and provide better sleep."