The Evolution (tm) Electronic Oxygen Conserver delivers a 5:1 oxygen savings ratio at all settings and delivers a uniform oxygen pulse from 14 to 40 breaths per minute. A single push button is used to select the appropriate dosage settings. When used for an average of 4 hours a day, Evolution (tm) Electronic Oxygen Conserver will function very efficiently on just one set of 2 AA batteries for a period of up to two years. Prescription required to purchase.
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