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Fitbit Inspire 4 (FB423) is a lightweight wearable fitness tracker from Fitbit (Google). It runs Fitbit embedded OS, connects to the Fitbit mobile App over BLE for synchronising heart rate, sleep and activity metrics. Bluetooth communication and local stored health data are encrypted. It supports regular OTA firmware updates. User identity relies on a linked Google/Fitbit cloud account, with secure BLE pairing and brute-force protection for pairing. Public exploits and hardware tampering cases for this model are rare.
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