From CNET: If you've got a Fitbit Sense or Versa 3, you have a few new features to explore on your smartwatch. With the update to Fitbit OS 5.1, you'll now have the option to use Google Assistant as your Fitbit's voice assistant instead of Amazon's Alexa, which has been available on the watches since launch. The update will also allow you to take calls on the watch when your phone is nearby, dictate text replies from your wrist (Android only) and access more health data while you sleep.
The update to OS 5.1 comes just a month after its last software update, which activated the built-in electrocardiogram (ECG or EKG) on the Fitbit Sense in the US, some European countries and Hong Kong.
Fitbit launched two new smartwatches in 2020: The high-end Sense with advanced health tracking features including ECG, stress detection and temperature tracking; and the Versa 3, a continuation of the Versa line with design upgrades and built-in GPS.
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