**Product Specifications:**
**Brand:** GREATWALL
**Year of Establishment:** 1987-1988
**Industry Ranking:** China's Top 500 Enterprises
**Key Features:**
- Excellent quality
- Well-regarded national brand
- Continuous presence in China's electronics industry
- Industrial Top 100 Enterprises
- World champion endorsements
**Innovative Design Features:**
- 90° infinite adjustment axis for comfortable wear
- 6 revolutionary breakthrough upgrades
- Skin-friendly silicone material
- HIFI stereo panoramic sound
- Directional sound transmission
- Long-lasting battery life
- IPX5 professional waterproof rating
- Bluetooth 5.49 chip upgrade
- High-definition noise reduction for calls
**Comfort and Fit:**
- 90° infinite adjustment for all-day comfort
- Ergonomic design for secure fit
- 90° vertical suspension angle for lightweight wear
- Adaptive fit for all ear shapes
**Sound Quality:**
- 16.2mm large diaphragm for superior audio
- ACS panoramic sound effect
- Directional sound transmission technology
- ENC noise reduction for clear communication
**Water and Sweat Resistance:**
- IPX5 level waterproof and sweatproof
**Additional Features:**
- Leak-proof technology
- Intelligent algorithm for enhanced call quality
**Certifications:**
- Professional dust and water resistance certification (IPX5)
**Usage Scenarios:**
- Suitable for sports and active lifestyles
**Compatibility:**
- Universally compatible with all ear shapes
**Package Includes:**
- Earphones, charging cable, user manual
**Warranty:** Manufacturer's warranty included
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