Both the sensor and PPG algorithm have been cleared by the US Food and Drug Administration and CE marked, meaning they’ve met both the US's and EU’s requirements for safety, health, and environmental protection. Spot checks require users to sit still with their palm covering the display, whereas passive monitoring does not. That’s in addition to the Sense’s still-included spot-check AFib sensor that existed in the previous Sense generation.
It uses photoplethysmography (PPG) to detect changes in blood volume (and therefore heart rhythm) that might indicate signs of atrial fibrillation (AFib). But it only works while the user is sleeping. Passive AFib detection is available on the Sense 2, Sense, Versa 4, Versa 3, Versa 2, Inspire 3, Inspire 2, Charge 5, Charge 4, and Luxe trackers. Before making its way to the new Sense 2, the company proved that its algorithm could detect 98 percent of AFib cases in a sample size of more than 450,000 people. The new algorithm for continuous AFib monitoring has, in some form, been in the works since 2020, when Fitbit launched a heart study centered on detecting AFib. Sounds high-tech, but ultimately it just means a slightly smaller bezel without the ring around it for EDA readings. If it senses stress, you’ll get recommendations for guided breathing or meditation exercises that you can do either on-wrist or in the Fitbit app. The Sense 2 can actually take on-demand EDA readings through the display itself "using a technique that turns metal into vapor, allowing to integrate the metal electrodes of these sensors directly into the display glass of the device," according to Fitbit. They’re both rated for about six days of use (without the always-on-display enabled) and now feature fast-charging capability that Fitbit claims can give you a day of battery life from only 12 minutes of charging.įitbit calls the new hardware a “Body Response” sensor, which will monitor your stress levels throughout the day and alert you when you’re under stress.
Setting the display to the optional “always on” setting takes battery life estimates down from 10 days to only three, which is much more in line with full-featured smartwatches, though less than Fitbit’s Sense and Versa watches.īy contrast, the Sense 2 and Versa 4 are the two most-capable trackers Fitbit offers. The Inspire 3, in particular, adds blood oxygen monitoring during sleep and a full-color AMOLED touchscreen to the entry-level tracker, which already can receive phone alerts, like texts, calls, and app notifications. “Basic” is a relative term among fitness trackers, as they all continuously edge closer to full-blown smartwatch functionality. All successors to previous-generation devices, the three run the gamut from Fitbit’s highest-equipped to most basic fitness wearables. Today, Fitbit announced the availability of three new fitness trackers: the Inspire 3, Versa 4, and Sense 2.
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