Fitbit Ionic Smartwatch Introduces Blood Oxygen Sensor

The Ionic differs from the firm's existing Blaze watch in that third-party developers will be able to release apps and watchface designs that can be installed on the device.

It also introduces a sensor that can detect blood oxygen levels.

Fitbit has also announced a forthcoming "special edition" in partnership with sportswear firm Adidas, mirroring the Apple Watch tie-up with Nike.

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