Control D Respirometer 3 Ball Lung Exerciser Respiratory Exerciser Spirometer is a breathing exerciser using the technique of sustaining maximum inspiration. It may help support lung performance and oxygen concentration. The respirometer is composed of a base and a central part divided into three chambers containing three small spheres. Three spheres rise proportionately to the inspiration exerted by the user.Uses:Can be used by fitness enthusiasts, yoga practitioners, individuals with lung-related concerns, and musicians playing wind instruments.Product Specifications and Features: Innovative design can be dis-assembled into parts for cleaning and disinfection For the exhalation, we can also turn upside-down the device Compact, high-quality break-resistant plastic Deep breathing exerciser for comprehensive respiratory fitness from 600 cc/sec to 1200 cc/ sec Specially designed with 3-stage chambers Directions for Use: Sit up straight and tall, and hold the spirometer in your hands Take a deep breath in and let it out Place the mouthpiece in your mouth Make sure your lips completely cover the mouthpiece Breathe in slowly through the mouthpiece (like sucking through a straw) Keep the range indicator (little marker on the side chamber) in the target zone Breathe in until the piston gets to your mark Hold your breath in for 3 seconds and then let it out Safety Information:Read the label carefully before use