OXYGEN CONCENTRATOR: this device is designed for providing a continuous flow of oxygen conveniently at home. Oxygen Concentrator DO2-5A can provide continuous physical enrich oxygen supply upto 93±3%. LOW NOISE MOTOR: Oxygen Concentrator DO2-5A comes with Low Noise motor which helps to reduce the noise to an extent so that the user feels extra comfort while using it for a long time. The Sieve Bed Life is approx. 10000 working hours under normal environmental conditions.