Shanghai Shiyao Import and Export Trade Co, Ltd is a professional oxygen concentrators expert all over the world.It provides oxygen concentrators for more than 5 million customers. Oxygen concentrators cover more than 10,000 types and accept OEM and customization. Welcome to send us inquiry.Advantages:-Mutiple platform purchase plans:We support alternative shopping options from other platforms with more than 1,000 online stores on Amazon,Ali express, Ebay, Lazada,Wish, Shopify. etc.-Full payment method acceptable such as Paypal, Western Union, Bank-transfer, Alibaba Trade-assurance, Ali-pay etc.At present, many of our products has passed CE ROHS ISO SGS FDA and some other testing certificates, reaching the industry-leading professional level. With many years' experience in oxygen concentrators industry, we are confident to offer the right things to customers. Our commitment to high quality, prompt response and timely delivery has enjoyed great customer satisfaction and maintained good and stable relationship with customers.Guarantee:-100% CE ROHS ISO certified products with 1 year quality warranty-Professional online- service (7*24 hrs) with technical support.-65% areas and countries all over the world are supporting the shipment from our overseas warehouses directly (save your time and shipping cost).-100% best price guarantee for most of models.-90% delivery time can be within 2-7 days.-Accept OEM service-Mix models in 1 or 2pcs is acceptable