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High Purity 5L Portable Medical Oxygen Concentrator for Home Use. Wide Flow Range: Adjustable outlet flow from 1 to 5 liters per minute to suit various needs. Low Noise Operation: Operates quietly with whole machine noise levels under 50dB(A). Lifetime Maintenance: Provides lifetime maintenance support for all purchased products. Flexible Customization: Offers full customization, minor customization, and options from samples or designs. Strict Quality Control: Implements 100% visual and functional inspection for all finished products. Fast Response Support: Guarantees a response within 8 hours for all inquiries and consultations. Multiple Payment Options: Accepts T/T, Credit Card, Western Union, PayPal, and other secure payment methods.