1. Transmission range: 20 meters
2. Channel: stereo
3. Single or dual ear: bilateral stereo
4. Function: support bluetooth, waterproof, noise reduction, voice
5. IPX6 deep waterproof, no fear of dust and rain, ensure worry-free journey, tight and stable structure
6. Bluetooth chip 5.3, low power consumption, stable connection, low latency, better sound quality, more stable signal
7. LED lighting, double-click the voice assistant button to turn on the light, simple and easy to use, easy to cope with dim and complex environments
8. Short press the voice button to wake up the AI ??voice assistant
9. 30 hours of long-lasting battery life, 1200mAh large capacity, AI power management chip, strong battery life for a whole day
10. High-end composite diaphragm, restore the essence of music to the greatest extent
11. The incoming call is automatically answered after the voice broadcast of the phone number, no manual operation is required, safer
12. Adopting mobile phone silicone microphone, CVC and DSP dual intelligent noise reduction, filtering noise effectively reduces decibels and improves call quality
13. Can connect two mobile phones at the same time, freely choose a device to switch to listen to music, navigation, and answer calls

Packing list:
- K21 host x 1
- Speaker microphone x 1
- Clip base x 1
- Installation sticker x 1
- Type-C charging cable x 1
- User manual x 1