Incentive spirometers are used to help patients improve the functioning of their lungs. This one way valve insures that patients inhale, rather than exhale into the unit. Patients will perform and monitor their own breathing exercises using the highly visible pistons and graphics. The exercises are designed to help patients take long deep breaths and improves the ability to clear mucus from the lungs. Other features include an O2 connection for supplemental oxygen, convenient handle, flexible popple tubing and bedrail holder.