Removable SD data card to be used with the ResMed S9 Series of CPAP, VPAP™, and AutoSet CPAP and Bi-Level machines. The ResMed S9 series SD data card plugs into the back of your CPAP or VPAP™ machine and is used to record the data compliance report generate by your sleep apnea therapy device. The SD card can be removed and send to your provider to download the CPAP compliance.