Measures FVC, FEV1, FEV1%, PEF, FEF25, FEF75 and FEF25–75
Displays flow-volume and volume-time curves
Built-in predicted values for comparison
Data storage, review, deletion and trend display
Calibration/scaling function
Automatic alerts when measured flow or volume exceeds limits
Rechargeable lithium battery
Automatic power-off after 1 minute of inactivity
USB connection for data transfer/PC software