Device Specifications Flow Rate: Approximately 3 liters/minute. Oxygen Concentration: Approximately 28% ± 2%. Device Dimensions: 26 × 11 × 17 cm. Weight: 2.4 to 2.5 kilograms. Noise Level: Less than 48-50 decibels. Power Source: Works with alternating current (AC 100-240V / 50-60Hz) or direct current (DC 12-17V). Power Consumption: Low, with an average of 32 watts. Battery (Accumulator): Built-in lithium battery (15V, 2.2A). Battery Charging Time: Approximately 8 hours. Battery Operating Time: Ranges from 60 to 80 minutes on a single charge. Operating Environment: Temperature 5-40°C, humidity less than 90%