The manufacturer previously reported an oxygen concentrator that alleged was not working during a flight.The battery allegedly was depleted prior to the flight.The patient was admitted to the hospital.The device was returned to the manufacturer's investigation laboratory for further evaluation.The device's downloaded event log was reviewed by the manufacturer.The event log confirmed the device was in use without having the batteries charged.The device visually and audibly alarmed and shut off.The device was tested and was found to operate and alarm to design specifications.Product labeling states,"make sure the battery is properly inserted and sufficiently charged.(the battery should be fully charged the first time you use it.).The device is not a life support device.
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