Given the importance of continued treatment compliance, portability has become an important consideration with the design of these machines. Over time, the machines have become lighter and more compact, with multi-voltage power supplies for international use.
For those requiring treatment on long-haul flights or camping trips, many of the newer machines are capable of being used on most commercial aircraft and have the ability for manual or automatic altitude adjustment. External batteries, power-inverters and/or car-battery powering are optional features on some devices.
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