Voldyne Incentive Spirometer 2 500 Ml * Volume Measurement Designed To Accommodate Large Inspired Volumes * Particulate Filter Screen In Device Housing Helps Reduce Risk Of Foreign Matter Passing To Patients * Expandable And Collapsible Tube Helps Patients Find Comfortable Position For Treatments And Can Be Removed When Storing The Device * Ergonomic Swiveled Mouthpiece Allows To Patients Create Tight Seal To Enable More Accurate Measurement * Flow Indicator With Smiley Face Provides Visual Target For Desired Inhalation And Bright Green Flow Indicator Make It Easy For Patients To See Results