BSMI Respirometer.

• product Type: 3-Ball Lung Exerciser
• Usage: Instructions For Use: Place the device at mouth level, exhale normally before inhaling, Inhale thoroughly until lifting the three balls (if, possible), and Hold inspiration as long as possible., Remove the mouthpiece and exhale., Repeat the process.
• Lung exerciser/breathing exerciser by this respirometer to exercise respiration system
• 3 stage chambers to provide more efficient exercise
• helps to take slow/long and deep breath to achieve maximum lung expansion.
• Products are 100% Original