description:
1. English voice prompt.
2. Send out the phone number.
3. Visualize the functions of the IOS system.
4. Answer/reject the call.
5. Redial the last number.
6. HD voice quality.
7. Solution: high-end solution.
8. Compatibility mode: compatible with all versions of Bluetooth.
9. Signal transmission channel: Cassl2.
10. Usage: Semi-in-ear style.
11. Microphone sensitivity: -42DB high-end transmitter.
12. The longest transmission distance: 10-15 meters
