Incentive spirometers are used to help wind and brass players improve their breathing. The breathing exercises are designed to help players take long deep breaths, similar to a yawn. Deep breathing leads to more efficient playing and helps improve phrasing and tone. A one-way valve ensures users inhale, rather than exhale into the unit. The Coach 2 has highly visible pistons to help users perform and monitor their breathing exercises without direct supervision. It's a real medical device, and includes a unit and flexible breathing tube. This unit functions similarly to the Voldyne (037940) except that it has half the measurement capacity (2.5 liters as opposed to 5 liters for the Voldyne). Features: • One-way valve - ensures users inhale only • 2500 ml (2.5 liter) capacity • Flexible tubing • Brightly colored piston • Universal graphics • Colorful deep-sea characters, games, puzzles and stickers • Instructions for use in base • Oxygen port • Bedrail holder • Coach® 2 For Kids handbook