Philips EverFlo Oxygen Concentrator An alternative to traditional cylinders, produces oxygen using room air without the need for other sources. Generates oxygen with a purity level reaching 90-96%. Low noise level below 43 dBA. Easy to carry and move within the room. Lighter weight compared to other devices, 14 kg. Oxygen flow rate 0.5 - 5 liters/minute (low flow option for children available at an additional cost). The device is equipped with visual and audible alarms in case of any malfunction, God forbid. The device has an audible alarm if oxygen level drops below 87%. On sum