This Fitbit tracks electrodermal activity (potential stress indicator) and skin temperature nightly. It offers atrial fibrillation assessment (ECG app, limited availability, 22+ age restriction), blood oxygen monitoring, and high/low heart rate notifications. It features 6+ day battery life with fast charging, built-in GPS, Bluetooth call functionality, and voice assistant integration (Google Assistant or Alexa). Band sizes are available for small (140-180mm) and large (180-220mm) wrists.
