1. Compatible Bluetooth Specification V2.0+EDR. 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. Battery type: Rechargeable Lithium DC 3.7V, 650maH (BL-5B).
8. Talk time: Up to 16 hours.
9. Charger time: 2~3hours.