Losing power overnight should not mean losing your therapy. The Portable Outlet X9 sits between the wall and your machine as an inline backup: plug your CPAP or BiPAP into the X9, keep it plugged into the wall, and if the power cuts out it switches to battery on its own, so your airflow never stops. No adapters, no extra cables, no setup. Because it puts out standard household AC power as a clean pure sine wave, it runs essentially any CPAP or BiPAP, full-size or travel, the same way a wall outlet would. A full charge powers most CPAPs about 10 to 12 hours, or 8 to 10 hours for a BiPAP. It travels well, too: at 159 Wh it sits just under the 160 Wh limit airlines set for lithium batteries, so it is FAA compliant and TSA-friendly as carry-on (some airlines ask you to approve spare batteries, so check before you fly). It comes with a travel bag and a 1-year warranty. Full specs, runtime, and travel tips are below.