美国采购需求：高压氧舱、高压氧舱、病人监护仪、超声波、AED、呼吸机

I recently received a fingertip pulse oximeter, but unfortunately, it arrived in non-working condition. I'm really hoping to get this issue resolved quickly, as I was looking forward to using the device. Given the circumstances, I would appreciate either a replacement for the faulty unit or a full refund if a replacement isn't possible. Additionally, I would like to know the process for returning the non-functional device, including any specific steps I need to follow and any information you might need from my side. Please let me know how we can move forward with this. Thanks for your attention to this matter!