The Minispir Spirometer is powered directly by the USB computer socket (no cradles and no batteries required). Features real-time flow/volume loops and volume/time curves with pre/post comparison and pediatric incentives. Supplied with disposable turbine flowmeter: always ready, clean, and calibrated for immediate spirometry testing. 100% accuracy and hygiene guaranteed (1 box/50 pieces always included at no charge). Includes WinspiroPRO PC software with data management and interactive tools. EMR-compatible (HL7 protocol). 4-year warranty.