Features: 1. Styled design, selected material, compact structure, simplified ear-phone shaped oxygen. 2. Mild airflow supplied for a harmonious atmosphere. 3. Advanced technology incorporated for precise oxygen concentration control to 28+/-2% for rich oxygen achievement. 4. Simplified concise control system with intensive design under the control of only 1 knob. 5. International standard adapter (100-240v) safely withstands serious change of power pressure and frequency. 6. Furnished with chargeable battery can be used at home, in a car and even the place without power supply. 7. Direct Currency and brushless motor ensuring quiet running and economical power consumption. Vector frequency conversion bringing powerful driving.Specification: Condition: Item Type: Oxygen GeneratorMaterial: ABSPlug Type: EU Plug, US Plug, UK Plug(Optional)Oxygen concentration: 28% 2%Rated voltage: AC100V-240V / DC12V-16.8VAir flow: About 3L/minOxygen supply: Directly supply Power: 30WNoise: 48dBApplication ambient temperature: 5~40C Humidity: less than 90% RHStorage ambient temperature: 0~40C Humidity: less than 80% RHSize: Approx.10 * 24 * 14.6cm / 3.9 * 9.4 * 5.7inPackage List: 1 * Main Machine 1 * Portable Bag 1 * Car Power Cord1 * Adapter1 * Battery Charger 1 * Nasal Oxygen Tube1 * Lithium Battery1 * Manual .