1. TPE medical silicone material, which is softer and does not hurt the skin for a long time; 2. Double-layer filtering, automatic filtering of environmental noise, the sound is clearer and more real; 3. Large battery capacity, charge for 1 hour, use for 10-20 hours 4. Smart chip, no fitting required; 5. One switch key, one volume adjustment key, easy to use; 6. FCC, ROHS, CE, EMC certification;