**Product Specifications:**
**Brand:** SANSUI
**Model:** i37-D
**Generation:** 4th
**Bluetooth Version:** 5.3
**Speaker Type:** Dual Dynamic Coil (137)
**Battery Life:** Up to 200 hours of continuous music playback
**Special Features:**
- Enhanced Bluetooth music streaming
- Improved battery life
- Advanced noise-cancelling technology
- Ergonomic design for comfortable wear
- High-fidelity sound with four speakers
- Biomorphic diaphragm for superior audio quality
- ENR noise reduction technology
- Whale cavity design for immersive sound experience
**Certifications:** National Quality Inspection, China Consumers Association, CTI Testing, PICC Insurance
**Compatibility:** Supports major music platforms on Apple, Android, and Windows systems
**Additional Features:**
- Ergonomic neckband design for sports and leisure
- Magnetic earbuds for easy storage
- High-capacity battery with quick charging
- Environment noise reduction for clear calls
- Voice assistant support for hands-free operation
- Bluetooth 5.3 for stable and fast connectivity
- Three-button control for easy operation
- Compatibility with popular voice assistants and navigation apps
- Real-time Bluetooth battery level display on mobile devices
**Note:** All testing data for this product is conducted by SANSUI laboratories.
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