. Flow Rate: Healthgenie Oxygen Concentrator HG-503 provides flow range of 1-5L per minute. The user can adjust the flow rate level as per the requirement. Maximum recommended flow rate is 5L per minute. Dense Oxygen Purity: Healthgenie Oxygen Concentrator HG-503 can provide continuous physical enrich oxygen supply upto 93±3% between a flow range of 1-5L per minute for 24 hours. Low Noise Motor: Healthgenie Oxygen Concentrator HG-503 comes with Low Noise motor which helps to reduce the noise to a extent so that user feels extra comfort while using it for long time. PSA: When the filtered air passes through one of the Moleculer Seives, the Moleculer Seives produces pure oxygen through Pressure Swing Adsorption Technique which is generally called PSA. The Seive Bed Life is approx. 10000 working hours under normal environmental conditions. Easy For Transportation: Healthgenie Oxygen Concentrator HG-503 comes with wheels for transportation so that the aged person can easily move the machine from one place to another without facing any trouble. Quality Assurance: Healthgenie Oxygen Concentrator HG-503 is certified with CE and ISO certifications. So, the user can buy it without worrying for the product quality.