Google’s upcoming Fitbit Air fitness tracker appears physically simple at first glance, but several of its functional design choices only become clear once the device is worn and handled regularly.

At the center of the wearable is what Google calls the “pebble,” the compact core unit that contains the tracker’s hardware. Fitbit has previously used the same term for the removable central component in earlier generations of its fitness bands, and the concept returns here in a more refined form.

The tracker’s left edge houses a small status light that works in coordination with the wristband itself. Each band includes a dedicated opening that allows the LED to remain visible, making orientation important whenever users switch straps.

Google’s setup instructions emphasize alignment during the band-changing process. Users are instructed to hold the outer edges of the strap near the device, press firmly on the top of the tracker to remove it, then snap it into a replacement band while ensuring that alignment markings on both the band and tracker match correctly.

The company also advises users to firmly double tap the top of the tracker after installation. If the LED does not flash, the tracker may need to be rotated and reinserted to ensure proper positioning.

That small status light serves multiple purposes beyond confirming orientation. According to Google’s documentation, a pulsing white light indicates charging activity, while a flashing red light signals low battery. A rapidly blinking white light appears during firmware updates, and a solid red light warns that the battery has reached a critically low state.

The same double-tap gesture used during setup also functions as a quick status check during everyday use. A white light means the tracker is operating normally with battery levels between 20% and 100%, while a red light signals remaining power below 20%. No visible light indicates the device is either powered off or fully drained.

Google has also assigned the gesture a practical role in alarm management. Users can silence Smart Wake alerts and one-time alarms configured through the Google Health app by firmly double tapping the tracker.

Meanwhile, Fitbit Air demo units have already appeared in all ten Google Store locations across the United States, including the company’s newest retail location that opened Friday. Early in-person comparisons with the Whoop fitness band suggest Google’s device is noticeably narrower in profile.

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That slimmer form factor, combined with the removable “pebble” approach and minimal external controls, points to a wearable designed around discreet daily use rather than overt hardware visibility. For now, much of the device’s interaction appears to rely on subtle gestures and a single indicator light rather than conventional buttons or screens.