Item NO:BCT003 *Full duplex, noise and echo cancellation, DSP technology *Bluetooth specification:1.2 *Built-in microphone and loudspeaker. *Built-in rechargeable li-on battery. *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!