Yesido TWS38

Yesido TWS38

Security Grade D Calculator v1

Yesido TWS38 (TWS True Wireless Bluetooth Earphones) Brand: Yesido (Parent: Shenzhen Yashitong Electronics Co., Ltd.) Category: TWS True Wireless Bluetooth Earphones (Category: Audio Accessories) • Model / Gen: Not clearly divided (no official generation labeling) TWS38 (no derivative models publicly disclosed) Release Date: 2022-03-04 • Status: In sale Classification Date: 2025-10-09 • (official brand website) Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	None	[No official URLs (low user demand for tampering entry-level TWS earphones; no public cases) 🔗 Proof]	Non-modular design, high difficulty for user disassembly. No public tampering cases due to low practical value.
Known vulnerabilities	None	[No official URLs (no vulnerabilities recorded in CVE Details/NVD as of May 2024) 🔗 Proof]	Simple functions, no complex system, low vulnerability risk. No public reports.
Prior attacks	None	[No official URLs (no attack events reported by tech media/security institutions) 🔗 Proof]	No sensitive data processing capability, low attack value. No public attack records.
Updatability	None	[No official URLs (no firmware update function mentioned on brand website/product manual) 🔗 Proof]	Does not support firmware updates; cannot fix potential issues or optimize functions via software.
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	No	[No official URLs (pairing only requires Bluetooth search, no system-level authentication) 🔗 Proof]	Only relies on basic Bluetooth pairing (default code 0000 or auto-pairing); no association with device accounts/cloud systems.
Communications	Encrypted with up-to-date encryption	[Reference: Bluetooth SIG official Bluetooth 5.3 encryption: https://www.bluetooth.com/specifications/bluetooth-core-specification/ 🔗 Proof]	Adopts AES-CCM encryption (built into Bluetooth 5.3), a mainstream and up-to-date encryption method for Bluetooth transmission.
Storage	No encryption	[No official URLs (product parameters confirm no local storage) 🔗 Proof]	No music/data local storage capability; no storage module, so no storage encryption is needed.
Category Score	Score: 3 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Absent	[No official URLs (no account registration/login mentioned on brand platforms) 🔗 Proof]	No account system; users do not need to create/manage accounts to use the product.
Authentication	Absent	[No official URLs (no identity verification required after successful pairing) 🔗 Proof]	No user authentication (e.g., password/fingerprint); anyone with a paired device or re-pairing capability can use the earphones.
Brute-force protection	Absent	[No official URLs (no limit on Bluetooth pairing attempts) 🔗 Proof]	No limit on Bluetooth pairing attempts; if a simple pairing code (e.g., 0000) is used, brute-force cracking is theoretically possible.
Event logging	Absent	[No official URLs (no storage/App to record events) 🔗 Proof]	No ability to generate/store logs; cannot trace connection history or operation records.
Passwords	Default/Common/Easy to guess	[No official URLs (auto-pairing or default code 0000) 🔗 Proof]	No mandatory password change requirements; Bluetooth pairing uses common simple codes or no code, which is easy to guess.
Category Score	Score: 3 / 3

Technical Specifications

Property	Details
Operating System & App	No independent operating system (relies on the connected device’s OS) (Companion App: No exclusive companion App; basic functions are adjusted via Bluetooth settings on the connected device)
Hardware (CPU / GPU)	CPU: Realtek RTL8763BFR (or similar entry-level Bluetooth 5.3 chip, from teardown info) • GPU: No independent GPU (not required for TWS earphone functions)
Memory & Storage	Memory: Integrated 64KB-128KB RAM (built into the Bluetooth chip, entry-level standard) • Storage: No independent storage (does not support local music storage)
Power, Battery & Charging	Battery: - Single earbud: ~30mAh - Charging case: ~300mAh (from e-commerce parameters) • Power: - Working power: ~5mW (Bluetooth connected state) - Charging power: Input (charging case) ~5V/1A (5W); Output ~5V/0.5A (2.5W) • Charging: - Port: Type-C (wired charging only, no wireless charging) - Charging time: Single earbud ~1.5h; Charging case ~2h (from product manual)
Display & Camera	Display: No display (no screen on earbuds or charging case) • Camera: No camera (no imaging function)
Sound & Connectivity	Sound: - Driver unit: 10mm dynamic driver - Frequency response: 20Hz-20kHz - Audio codec: SBC - Additional: Basic call noise reduction (via built-in microphone) • Connectivity: - Bluetooth version: Bluetooth 5.3 - Connection range: ~10m (obstacle-free) - Supported protocols: HFP, HSP, A2DP, AVRCP - No NFC/WiFi/Bluetooth multipoint (public parameters)
Physical (Dimensions & Mass)	Dimensions: - Single earbud: ~20mm × 18mm × 25mm - Charging case: ~60mm × 40mm × 28mm (from e-commerce parameters) • Mass: - Single earbud: ~4.5g - Charging case: ~35g (from e-commerce parameters)