VTB-88A .Bluetooth specification:2.0 range:0-10m .Easy to install without removing the original rearview mirror. .Independent FM wireless earpiece to protect your privacy. .30 seconds record and play function. .Super bright LED caller No. display. .Complete bluetooth wireless installation. .DSP technology to suppress noise and echo. .With 1600MA lithium battery to provide standby time of one week, talking time of 11hrs and headset talking time of 5hrs. .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 channels. .USB faucet for software updating.