Brand New. Never Used. 1.COMPRESSOR Oil-free compressor, providing plenty of air supply. The service life is more than 15,000hours, low power consumption and noise. 2.OXYGEN OUTPUT Equipped with two oxygen inhaling tubes.(2 meters and 6 meters) 3.NEBULIZER (OPNTIONAL FEATURES) The atomized medicine should follow the doctor’s advice. The flow rate of the oxygen should adjust to 1L/min when atomizing. 4.THERE ARE THREE FILTERS The primary one could filter the big impurity in the air; the secondary and third filter use special material which can filter the small particle in the air ≥0.5um; the filter cotton could be replaced easily. 5.CONTROL FUNCTIONS US imported chip, ensuring a reliable performance. Functions: Display total using time, low voltage and clean filter prompt facility; delay shutdown(in order to lower the temperature of the machine, the flow fan will still working for 99 seconds which could longer the service life). 6.HUMIDIFY BOTTLE The humidified oxygen is more comfortable for the user. 7.The Molecular Sieve has longer service life and steadier oxygen concentration 8. SHELL Qualified cold rolled sheet, thickness 1.22mm, sturdy construction, excellent heat elimination; 9. RADIATOR Ribbed radiator with good heat elimination, slowly temperature rising could work continuously. It has a longer service life. 10. LOW NOISE It is specially designed for a low working noise, ≤45±2Db. ISO and CE Certified Manufacturer.