ResMed AirSense 11 (S11) AutoSet APAP & Heated Humidifier - Auto CPAP Machine PackageResMed AirSense 11 (S11) AutoSet APAP & Heated Humidifier Auto CPAP Machine Package Model Number: 39420, 39000, 39001 Condition: We have Brand New S11 auto machines for $1000 and Lightly Used machines for $500 and Very Used machines for $400. Our Lightly Used machines have less than 1000 hours.(that's less than 4 months use). Our Very Used machines have over 1000 hours between 1,000 hours and 10,000 hours. Machines can last up to 30,000 hours