Item NO. VTB-80A Bluetooth Hands Free Car Kit (rear view mirror) Features:  Bluetooth specification:2.0; range:0-10 m  Easy to installation and no need to remove the original rear view mirror  Super bright LED caller NO. display  USB faucet to software framework update.  DSP technology, Full duplex, noise and echo suppression.  Complete blue tooth wireless installation  With 1600mAh Lithium battery to provide typical standby time of more than 192 hours talking time of 12 hours  Voice dialing, last call redialing, and call waiting function.  Built-in high intelligent microphone and powerful speaker. Packing / specification Number per ctn:10 pcs / ctn N.W: 9.09 kg / ctn G.W.:8.39 kg / ctn Measure: 35.5 cm X 32.5 cm X 38.5 cm