Romsons brings you the best respirometer for your lung exercise. So, you can easily overcome that frustration of not being able to climb up stairs without experiencing shortness in breath or you can easily go for a walk without feeling tired. This is a specially designed product with 3 chambers which containing 3 small spheres different in size and colour. Transparent main body. Base. Small sphere of Red, Yellow and Blue colour. Connecting tube with mouth piece.