New study of ours comparing the Biostrap Kairos wristband to ECG for HRV assessment.

The Kairos wristband offers on-demand heart rate variability (HRV) assessment
through its “Spot Check” feature, enabling standardized recordings for clinical, research,
or self-tracking purposes, but its validity is untested. Therefore, we compared the Kairos
wristband to electrocardiography (ECG) for resting HRV assessment in young adults,
and investigated the influence of skin pigmentation (M-index) on measurement accuracy.

Keep reading the full text here: Biostrap Kairos Wristband vs ECG for HRV