The Safey Doctor App communicates with Safey Clinic Spirometer via Bluetooth. The app is a multi patient use app for Doctors only and depending on the type of device, it will measure following parameters: Forced Vital Capacity FVC Full Volume Loop Volume expired in the first second - FEV0.75, FEV1, FEV3, FEV6 Ratio between volume expired in a certain time period and FVC - FEV/FVC (FER) for 0.75/1/3/6 Peak expiratory flow - PEF Forced expiratory flow between the first 25% and 75% of the FVC