Philips EverFlo Oxygen Concentrator, a home medical device designed to provide a continuous source of oxygen for patients requiring oxygen therapy. Function: The device draws in room air, filters it, separates oxygen from nitrogen, and delivers high-concentration oxygen (up to 90-96%) to the patient. Features: The device features a compact and relatively lightweight design (approximately 14 kg), making it easy to move around the house, and it operates with low noise. The device is almost new.