Breathing Machine can adjust the treat pressure automatically 1.Dimension:220x194x112mm, 313x194x112mm 2.Weight:1.6kg ... c Humidity: ≤ 80% Non-condensing ≤ 93% Non-condensing Atmospheric Pressure: 860 to 1060 hPa 500 to 1060 hPaStandard ComplianceIEC 60601 ... (±1 hPa)Altitude Compensation Manually setting, level 0, 1, 2 Automatic altitude compensationSound Pressure Level <30 dB,when the device is working ...