1.Bluetooth Specification V2.1, Class2.

2. Operating Frequency Band: 2.4GHz ~ 2.48GHz unlicensed ISM band.

3. Support Multiple paired. (2 Bluetooth Phones can be paired meanwhile).

4. Integrated with echo cancellation and Noise suppressor.

5. One-Touch Answer, Call Rejection, Last Number Redial.

6. Advanced built-in louder speaker and microphone.

7.  Rechargeable Lithium DC 3.7V, 650mAn (BL-5B).

8. Talking time: at least 16 hours.

9. Charging time: 2~3 hours.