Redmi Watch 15 Active (25047RN27G)

Redmi Watch 15 Active (25047RN27G)
Security Grade B Calculator v	Redmi Watch 15 Active Brand: Redmi (Parent: Xiaomi Corporation) Category: smart watch • Model / Gen: Watch 15 Series 25047RN27G Release Date: 2026-04-05 • Status: In sale Classification Date: • [[1](https://www.mi.com/global/product/redmi)‑watch‑15‑active/ Official Website]

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	Rare	[[2](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Plastic frame is easy to open, but public hardware tampering exploits for this entry watch are limited.
Known vulnerabilities	Rare	[[3](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Few known public vulnerabilities; vendor pushes regular HyperOS wearable security patches.
Prior attacks	None	[[4](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	No large‑scale real‑world public attacks targeting this exact watch model.
Updatability	Very common	[[5](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Regular official OTA firmware and security updates are provided.
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Partial	[[6](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Requires pairing with Mi‑account; full cross‑device mutual authentication is limited.
Communications	Encrypted with up-to-date encryption	[[7](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Bluetooth and cloud data use modern TLS encryption protocols.
Storage	Encrypted with up-to-date encryption	[[8](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Local watch storage is encrypted by HyperOS.
Category Score	Score: 2 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Full	[[9](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Bound to Mi account, supports account binding and permission management.
Authentication	Secure	[[10](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Secure phone‑pair authentication, no hard‑coded default credentials.
Brute-force protection	Exist	[[11](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Lock‑out mechanism for repeated failed pairing attempts.
Event logging	Partial logging	[[12](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Partial pairing and security‑related events are logged locally.
Passwords	Require change after setup with complexity requirements	[[13](https://trust.mi.com/zh)‑CN/misrc/updates/watch 🔗 Proof]	Mi‑account password complexity rules apply for bound access.
Category Score	Score: 2 / 3

Technical Specifications

Property	Details
Operating System & App	Xiaomi HyperOS 2 (Companion App: Mi Fitness)
Hardware (CPU / GPU)	CPU: Low‑power wearable processor • GPU: Integrated wearable graphics
Memory & Storage	Memory: 128MB • Storage: 512MB local storage
Power, Battery & Charging	Battery: 470 mAh typical • Power: Magnetic contact charging • Charging: 2‑pin magnetic charging dock
Display & Camera	Display: 2.0‑inch LCD, 320×385 resolution, 60Hz refresh rate, peak brightness 500 nits • Camera: Not applicable
Sound & Connectivity	Sound: Built‑in speaker, dual‑microphone array, support Bluetooth calling • Connectivity: Bluetooth 5.4, GNSS (Beidou/GPS/Galileo), 5ATM water resistance
Physical (Dimensions & Mass)	Dimensions: 49.1 × 40.4 × 11.4 mm • Mass: 30.6 g (without strap)

This is Redmi Watch 15 Active (model 25047RN27G), an entry‑level sports smart watch running Xiaomi HyperOS 2 wearable system. It receives regular official OTA firmware and security updates, supports encrypted Bluetooth and cloud communication as well as local storage encryption. It uses Mi‑account‑bound pairing authentication, includes brute‑force protection for pairing attempts and partial local security event logging. Hardware disassembly is easy, but public tampering exploits are rare; known vulnerabilities are limited and patched timely by the vendor.