Fitbit's most advanced smartwatch Sense and Versa 3 are getting Fitbit OS 5.1 software update that improves the health capabilities and convenience features of both the premium smart watches.

The new update enhances the blood oxygen-monitoring (SpO2) experience and adds new on-device voice-enabled capabilities with the availability of Google Assistant, Bluetooth calling and audible replies for Alexa users.

Both Fitbit Sense and Versa 3 can now track blood oxygen levels while sleeping and users can see their average in the Fitbit app without using a specific SpO2 clock face. In addition to the free signature SpO2 clock face, Fitbit will offer seven additional new faces in the app gallery by the end of the year.

Google Assistant enhances the on-device experience by letting users check the weather forecast, set an alarm or check sleep duration as well as control smart home devices, all from the wrist with the touch of a button. Google Assistant is currently rolling out in the U.S. and will expand to additional markets including Australia, Canada, India, Ireland, New Zealand, Singapore and the U.K. in English by 2020-end.

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