Get on the road with the Nokia Wireless Plug-in Car Handsfree. This compact unit communicates with your compatible phone via Bluetooth wireless technology within a 10-meter range. This compact unit communicates with your compatible phone via Bluetooth wireless technology within a 10-meter range. "Speech tracking" uses four microphones selecting from 19 directions to lock on to the direction from which speech is coming and filter out any unwanted background noise coming from other areas. Plus it's easy to install - just plug it in to the vehicle's lighter socket.