The model S400 OEM Board is used in a monitor for spot checking or monitoring of a patient’s %SpO2 and pulse rate. The model S400 OEM Oximeter performance is similar to the BCI 3420 Oximeter in accuracy, range, and averaging for %SpO2 and pulse rate. In addition to averaged SpO2, the S400 OEM board transfers instantaneous SpO2, particularly useful during sleep studies. The S400 OEM is compatible with all BCI sensors. The S400 OEM board can be used with neonatal, pediatric, and adult patients.