Used S11 Resmed CPAP low hours. Perfect condition. Was moved to another machine no longer need this. $200 OBO includes new unopened water jug and tubing ($60.00) Also has new unused F40 mask ($140.00). This set up cost me $1300.00 basically all you need to get started. I can also show you how to change the settings. You are getting a great deal the mask and tube cost as much as I am asking for everything.