There's Connected GPS on all three devices, but only the Charge 5 has built-in GPS, allowing you to go for a run and it track your route without your phone. Blood glucose tracking is also possible with all three trackers. The three devices also offer an SpO2 sensor for blood oxygen tracking and they can also all detect skin temperature variation and breathing rate. ![]() The Fitbit Inspire 3, Fitbit Luxe and Fitbit Charge 5 all offer a heart rate sensor for 24/7 tracking, along with heart rate variability, resting heart rate and irregular heart rate rhythm notifications.
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