The built in Barometer adjusts for Altitude increase while reducing your work load in the cockpit. No more forgetting to tweak your oxygen flow during ascent and descent with a manual system .

Oxygen flow can be set to commence at ground level or a given altitude. The unit can be set to Fully or Semi Automatic or Manual.
> Mode N - oxygen is delivered from when you turn it on.
> Mode D - oxygen flow commences from a given altitude,
5,000 or 10,000ft
> Mode F - used when wearing a face mask and it delivers an
enriched flow of oxygen. Useful for pilots who find that the
standard flow is not sufficient.
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