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GB513FL is the model number for the Fitbit Sense 2, released in September 2022 as Fitbit's premium health-focused smartwatch, now owned by Google (acquired in 2021). It succeeded the original Fitbit Sense (2020). Key hardware: 40.5 mm square AMOLED touchscreen (336 x 336, always-on display), Gorilla Glass 3, aluminum case. Sensors include ECG, cEDA (continuous electrodermal activity), skin temperature, SpO2 (red/infrared), altimeter, 3-axis accelerometer, ambient light, and gyroscope. Built-in GPS + GLONASS for standalone workout tracking. NFC supports Google Pay. Bluetooth 5.0 for phone connection and hands-free calling via built-in mic/speaker. WiFi hardware is present but disabled in firmware. Battery is ~260 mAh Li-Po rated for 6+ days, with fast charging (12 minutes gives 24 hours). Water resistance is 5 ATM. Weight is only 37.64 g (without band). Security model: the watch pairs with a phone running the Fitbit app (iOS 11+ / Android 10+). A Google/Fitbit account is required for cloud sync, health data backup, and features like Alexa. On-device security is minimal: no biometric unlock, no TPM, no secure element. The watch can be protected with an optional 4-digit PIN. Health data (ECG, EDA, SpO2, sleep, heart rate) syncs encrypted to Google's cloud. Fitbit/Google guarantees at least 2 years of security updates after the device is last sold. No enterprise MDM support.
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