Digital spirometer with Wireless transmission. Scaling (calibration). Information prompts when volume or flow goes beyond the limits. Automatic power off when there is no operation in one minute. Rechargeable lithium battery and with charging tips. Battery power display. Volume range: 0-10Ltr. Volume accuracy: ±3% or 0.05Ltr. Flow range: 1 L/S - 16 L/S. Flow accuracy: ±10% or ±0.3 L/s.