ResMed AirSense 11 DC-DC Converter

I bought this because I run my CPAP through a EcoFlow River 2 Pro power station. A night with the normal AC adapter was taking 30-35% of my power station battery through the AC adapter. With the DC adapter, it takes approximatively 12-15% per night. I was able to run it for a whole week without charging it. Since there's not current conversion between AC and DC, it's much more energy efficient.