Sleep tracking works in the same way as other recent Fitbit devices, and I love how much detail you get here, from sleep stages, to restlessness, to sleeping heart and breathing rates.
Holding your fingers to the sides ends up feeling a little more awkward than the Sense's method of measuring which involves holding your palm over the screen, but it also means you can see the display as you're testing stress. The idea is the more EDA responses, potentially the more stressed you are. It detects minute changes in sweat, and afterward you can see how many EDA responses, or sweat-triggered incidents, you had. Use it by placing your fingers on either side of the Charge 5 and taking a two- to seven-minute scan. There's also an electrodermal activity sensor first seen on the Fitbit Sense for tracking stress. Onboard is a heart rate tracker with high and low heart rate alerts an electrocardiogram app that detects signs of atrial fibrillation an SpO2 sensor for blood oxygen levels plus skin temperature tracking at night (but no dedicated skin temperature sensor like on the Sense). Heart-rate alerts, ECG and all the health metrics you could wantĮven though the Charge 5 is significantly smaller than Fitbit's smartwatches, it doesn't skimp on sensors.
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