With this adapter cable you can power your AirSense 10 Series or Luna G3 & React G3 X Series CPAP Machines from the Pilot-Flex CPAP Battery Pack; and you can recharge the battery using the AC Power Cord from your sleep therapy device as well! It's a great option if you want to sleep with your CPAP on the road, in the air, on a cruise, or just about anywhere you go.