Xiaomi Watch S4

Xiaomi Watch S4
Security Grade A+ Calculator v1	Xiaomi Watch S4 Brand: Xiaomi Category: smartwatch • Model / Gen: 4 Xiaomi Watch S4 ：M2425W1 Xiaomi Watch S4 eSIM ：M2424W1 Xiaomi Watch S4 eSIM 15 Release Date: 2024-10-29 • Status: In sale Classification Date: 2025-10-10 • Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	None	🔗 Proof
Known vulnerabilities	None	🔗 Proof
Prior attacks	None	🔗 Proof
Updatability	Very common	🔗 Proof
Category Score	Score: 1 / 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	Xiaomi Surge OS2 (Companion App: Xiaomi Wearables)
Hardware (CPU / GPU)	CPU: Snapdragon Wear 5100 (or MediaTek MT2735) – mid-range wearables processor optimized for low power consumption • GPU: Adreno A504 (paired with Snapdragon Wear 5100) or integrated GPU in MediaTek MT2735
Memory & Storage	Memory: 2GB LPDDR4X – for smooth multitasking of apps, notifications, and fitness tracking • Storage: 32GB eMMC – for storing apps, music, offline maps, and fitness data
Power, Battery & Charging	Battery: 500mAh lithium-ion polymer battery – supports up to 14 days of typical use, 7 days of heavy use, or 36h of GPS mode • Power: Typical power consumption: ~3mA (idle); ~15mA (active fitness tracking); ~80mA (GPS + heart rate monitoring) • Charging: Magnetic wireless charging – 0-100% charge in ~60 minutes; supports fast charging (10min charge = 30% battery)
Display & Camera	Display: 1.43-inch AMOLED round display – 466x466 resolution (326 PPI), 100% DCI-P3 color gamut, 500 nits peak brightness, scratch-resistant Corning Gorilla Glass 3 • Camera: No built-in camera (consistent with most Xiaomi "Watch S" models, which focus on fitness/utility over imaging)
Sound & Connectivity	Sound: Built-in speaker (for calls, notifications, and voice feedback) and microphone (for voice commands, calls) • Connectivity: - Bluetooth 5.3 (for phone pairing, earbuds connection) - Wi-Fi 802.11 b/g/n (2.4GHz) - NFC (for contactless payments via Mi Pay) - GPS/GLONASS/Galileo/QZSS (for accurate location tracking) - Heart rate sensor, SpO2 sensor, blood pressure monitor, sleep monitor, and 100+ sports modes
Physical (Dimensions & Mass)	Dimensions: 46*46*11.1mm • Mass: 42.6g