BT211 car kit can provide the following functions: 1. BT V1. 2, HFP/ HSP, AVRCP/ A2DP; 2. Compatible with almost all mobile phones with bluetooth; 3. Auto pairing; 4. Pairing up to 4 phones, Automactically connected to the last paired phone; 5. Full duplex conversation, DSP arithmetic for echo cancellation&noise reduction; 6. Caller ID read out in English. 7. High powered amplifier output and uses the vehicle's speakers; 8. Directional high sensitive microphone; 9. Voice dialing, Redial, Pick up , Hang up; 10. Automatic loudspeaker mute. 11. Microphone mute.