The full featured spirometer that fits in your hand. Weighs just over a pound. Disposable mouthpieces insert into the side of the unit and patient blows directly into it. No cables or wires. Takes both expiratory and inspiratory measurements, and can do flow volume loops. Cordless - just point and click the SP-2 at an infrared printer adapter, or an infrared printer to download and print data. Provides 3 different reports - Flow/Volume, Volume/Time and/or Measurement Value. Stores up to 300 maneuvers in its flash memory. When batteries are changed (2 AA) the data is not lost and can still be downloaded for printing.