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The smallest and lightest CPAP (Continuous Positive Airway Pressure) system on the market, Puritan Bennett's GoodKnight 420G is stylish, portable and convenient. It was designed from the ground up for the person on the go so that your therapy can fit in with your lifestyle, not the other way around. The GoodKnight 420G provides quiet, effective CPAP therapy for a wide range of patients.^features~