The S9 Oximeter Adapter by ResMed is manufactured to ease monitoring your blood oxygen saturation levels during CPAP therapy to help assist in the quality of treatment.It works efficiently with ResMed S9 CPAP device, though it was designed to work with NONIN Xpod Oximeter.The adapter gathers data on oxygen saturation by perfectly fitting on your finger.The data acquired by the adapter is stored on the ResMed SD card for easy accessibility. The machine preserves all your data on the SD card which you can then view easily on your computer screen. The adapter has been tested to ensure that it withstands significant movement, remains in place throughout your sleep and can function in any climatic condition. It is ideal for patients who seek care of quality. It is easy to install and use.