Bluetooth specification: 2.0; Range: 0-: 10 m Easy to installation and no need to remove the original rearview mirror Independent FM wireless earpiece to protect your secrets 35 seconds record and play function Super bright LCM caller english name display Complete blue tooth wireless installation DSP technology, Full duplex, noise and echo suppression. With 1600mAh Lithium battery to provide typical standby time of more than 168 hours talking time of 11 hours and headset talking time of 5 hours Voice dialing, last call redialing, and call switching function. Built-in high intelligent microphone and powerful speaker. Transmit the signal into car radio by FM frequency USB faucet to software framework.