The Safey App communicates with Safey Peak Flow Meter and Safey Pocket Spirometer via Bluetooth. The app is a single patient use app and depending on the type of device, it will measure following parameters: for Peak Flow Meter - PEF & FEV1 for Pocket Spirometer - Forced Vital Capacity FVC 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 - FEF25-75 (MEF) Volume inspired in the first second of the test - FIV1 Forced inspiratory volume - FIVC Peak inspiratory flow- PIF Forced inspiratory flow in the first 25% and 75% of the FIV - FIF25-75 (MIF25-75) Ratio between FEV1 and FEV6 - FEV1/FEV6 FEV1/FEV6 Forced expiratory flow at 50% of FVC divided by FVC - FEF50/FVC Forced inspiratory flow in the first 25% and 75% of the FIV- FIF25-75 (MIF25-75) Ratio between FEV1 and FEV6 - FEV1/FEV6 FEV1/FEV6 Forced expiratory flow at 50% of FVC divided by FVC - FEF50/FVC Force inspiratory flow at first second - FIV1/FIVC (FIR) Forced expiratory time - FET