This is a medical grade Oxygen Concentrator, designed to output between 87%-93% oxygen purity at any setting on the adjustable Flow Meter. Compare this to other models being sold online, IE: 1-9LPM Constant Flow, which sounds impressive, but they only claim 95% purity at 1LPM. The higher you adjust it, the lower the purity drops. This is NOT what you need for your pet in a rescue situation where purity and high flow matter the most!