I purchased 2 Voldyne Volumetric Incentive Spirometer 5000ML each $8.42 and I received a little cylinder with a red ball and a mouth piece. I posted a picture for everyone to see. This is not what the description says for this I give 2 stars. I wanted the one from picture, since I don't know what I am doing and there is no chart to help just a piece of paper that tells how to use it and a short explanation what is used for. This one advice you to account seconds and multiply the number above with the seconds. Should I inhale or should I count? I don't know what to do first lol.