Fitbit Sense 2 Advanced Health Smartwatch (FB521)

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Fitbit Sense 2 Advanced Health Smartwatch (FB521)
Security Grade
   
     A
Calculator v1
Fitbit Sense 2 Advanced Health & Fitness Smartwatch
   Brand: Fitbit (Parent: Google LLC)

   Category: Health & Fitness Smartwatch • Model / Gen: 2 FB521

   Release Date: 2022-09-10 • Status: In sale

   Classification Date: 2025-10-16 • Official Website

Security Evaluation

1. Device Security

Criterion Value Proof Comment
Known hardware tampering None 🔗 Proof
Known vulnerabilities Rare 🔗 Proof
Prior attacks Rare 🔗 Proof
Updatability Very common 🔗 Proof
Category Score Score: 2 / 3

2. System Security

Criterion Value Proof Comment
Authentication with other systems Full 🔗 Proof
Communications Encrypted with up-to-date encryption 🔗 Proof
Storage Encrypted with up-to-date encryption 🔗 Proof
Category Score Score: 1 / 3

3. User Authentication

Criterion Value Proof Comment
Account management Full 🔗 Proof
Authentication Secure 🔗 Proof
Brute-force protection Exist 🔗 Proof
Event logging Access event logged 🔗 Proof
Passwords Require change after setup with complexity requirements 🔗 Proof
Category Score Score: 1 / 3

Technical Specifications

Property Details
Operating System & App Fitbit OS (Companion App: Fitbit App)
Hardware (CPU / GPU) CPU: ARM Cortex-M4 processor • GPU:
Memory & Storage Memory: 4GB storage • Storage: 4GB internal storage
Power, Battery & Charging Battery: Lithium polymer, 6+ days battery life • Power: Proprietary charging cable • Charging: Magnetic charging doc
Display & Camera Display: 1.58" AMOLED always-on display • Camera: None
Sound & Connectivity Sound: Built-in speaker and microphone • Connectivity: Wi-Fi 802.11 b/g/n, Bluetooth 5.0, GPS/GLONASS
Physical (Dimensions & Mass) Dimensions: 40.5 x 40.5 x 12.3mm • Mass: 37.6g (without band)


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