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Objective: To describe the reference value of arterial stiffness parameter measurement by wrist worn device (Microsoft) in west Spanish population. Methods: Cross-sectional study. Study population: From the population assigned to the participating healthcare centres, a cluster random sampling stratified by age and gender was performed to obtain 501 participants aged between 35 and 75, 100 per decade, (50% women) without cardio or cerebrovascular disease. Measurements: Central (CAIx) and peripheral (PAIx) augmentation index, Heart rate (HR) and heart rate variability (HRV) by a new wrist worn device developed by Microsoft. Results: Mean age was: 55.9 ± 14.2y. Mean PAIx was 91.22 ± 16.05, in women 95.34 ± 16.17 and in men 87.08 ± 14.86 (p0.05). The PAIx and CAIx increased with each decade, (PAIx was 79.85 in born in 1981 and 99.68 in born in 1941, and CAIx 19.25 in born in 1981 to 35.11 in born in 1941), and HRV decrease with each decade (3.31 in born in 1981 and 2.52 in born in 1941). No differences were found in heart rate. This data is the same in men and women. Correlation of age with PAIx was r = 0.424, CAIx r = 0.323, HRV r = -0.364 (p > 0.01 for all) and HR 0.51 (p > 0.05). Conclusion: The PAIx and CAIx were higher in women than men. PAIx and CAIx increase with aging while the HRV decreases.