1-7 Liter Adjustable Household Oxygen Concentrator Machine - 93% Pure Oxygen Flow for Home Use | Portable Oxygen Generator for Sleep, Travel & Respiratory Therapy

I bought this for my mother in law to use at church. She is in poor health, but still wants to be of service to others. I thought this would be more convenient than trying to transport tanks of oxygen. It's small and very portable. It's lightweight, but still very sturdy. It's just as good as her full sized one that she uses at home. Her oxygen levels are doing great and she feels much better now. She's so happy to have her energy levels back to normal. It does make a bit of noise, but it's similar to her full sized oxygen concentrator.