MAXM86161 EVSYS is the evaluation kit for MAXM86161. It includes MAXM86161 and MAX32664C. Users can measure SpO2 by MAXM86161 EVSYS, but as for HRV, MAXM86161 EVSYS cannot output it directly, so users need to use their algorithm to extract the data acquired from MAXM86161 EYSYS, or users may design their own board by using MAXM86161 and MCU to calculate HRV.