End user claimed the unit stopped providing oxygen on the plane.He found the unit could not be charged on the plane after boarding and he also took an additional battery however it held just 40 minutes then the unit shut down.Since his flight duration was 3.5 hours, he felt it hard to breathe even after the flight attendant gave him the emergency oxygen to support, the plane was urgently landed at another airport.The end user is still in the hospital and refused to provide the unit for evaluation.
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