Use the AVIC-Z1 with Bluetooth wireless technology enabled cellular phones for easy, safe, and hands-free operation, including talking via the headunit's microphone and your vehicle's speaker system. The system automatically mutes any other audio during incoming or outgoing calls. You can store the phone book, then access it by voice or the touch screen display. For even more convenience, you can access phone numbers associated with the POI database, letting you call the location you are being guided to.