印度采购需求：氧气发生器，氧气治疗，便携式氧气浓缩器，呼吸

I'm reaching out to get some details on a portable oxygen concentrator I'm interested in. Specifically, I'm looking for a model that delivers around 3 liters per minute. Could you provide me with information about the available options, including pricing, lead times, and any certifications or warranties that come with the product? I'm keen to understand the specs and features to ensure it meets my needs. Thank you!