The Versa 4 and Sense 2 look very similar, though the latter does bring serious health sensors such as ECG, skin temperature, and an electrodermal activity (EDA) sensor that tracks stress.
You get up to 7-day battery life, a bright AMOLED touch display, built-in GPS and SpO2 and ECG sensors. In terms of deals, the Fitbit Charge 6 usually retails for $159. It can regularly be found ...
Abstract: In this work, silver silverchloride (Ag/AgCl) gel patches used in ECG monitoring are replaced with flexible, lightweight, in-situ polymerized conductive polymers. Specifically, the study ...