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Garmin Vivosmart 4 tracks your sleep and energy levels

The wearable monitors the oxygen saturation in your blood while you sleep.
Mariella Moon, @mariella_moon
August 30, 2018
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Cherlynn Low / Engadget

Garmin has launched the latest version of Vivosmart, and based on its features, the wearable is meant to be a direct competitor to Fitbit's Charge 3. Like Fitbit's new tracking device, Vivosmart 4 comes with a blood oxygen monitor called "pulse ox," which can monitor your oxygen saturation levels at night in order to gauge your sleep quality. It also has the ability to estimate light, deep and REM stages of sleep, which you can then view as sleep stats within the Garmin Connect app.

Gallery: Garmin Vivosmart 4 first look | 7 Photos

One of its other new features is the ability to gauge your energy levels based on your stress, heart rate variability, sleep quality and activity. A high "Body Battery energy" means Vivosmart 4 thinks you'll be able to handle heavier tasks like working out, while a low one means the device believes you need to take it easy. To make that new feature possible, Garmin has redesigned its heart rate sensor to make it more powerful and made sure the device has all-day stress tracking, which comes with a relax reminder function that suggests you take a breather if your stress levels go through the roof.

Vivosmart 4 is pool- and shower-safe and can run for up to seven days between charges. With a retail price of $130, it's $20 cheaper than the Charge 3, though take note that it looks like it has a slimmer display than its rival. The device is now available for purchase worldwide from Garmin's website and from various retailers, including Amazon and Target.

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