*Bluetooth specification: 1.2 *Built-in microphone and loudspeaker. *Super brighr LED display panel for incoming call indication. *Voice dial & Redial. *Record important information during conversation. *Wireless headset, convenient for private conversation at anytime. *FM FREQUENCY SELECTION KEY: select between 4 preset FM Frequencies(FM88.1, FM88.5, FM88.7, FM89.4) to tune in your CarAtereo and listen to your call. *USB PORT: for firmware upgrade only