Attractive features: 1. DSP technology, Full duplex, noise and echo suppression. 2. Voice dialing, last call redialing, and call switching function. 3. ndependent FM wireless earpiece to protect your secrets. 4. 35 seconds record and play function. Detailed specifications: 1. Bluetooth specification:2.0 range:10m 2. Easy to installation and no need to remove the original rearview mirror. 3. Super bright LCD caller NO. display 4. Complete bluetooth wireless installation 5. With 16000mAh Lithium battery to provide typical standby time of more than 168 hours talking time of 11 hours and headset talking time of 5 hours 6. Built-in high intelligent microphone and powerful speaker. 7. Transmit the signal into car radio by FM frequency 8. USB faucet to software framework update.