The Universal Bluetooth™ Hands-free Mobile Telephone Interface integrates with the car's speaker system, Driver Information System (where present) and satellite navigation system (where installed) allowing the driver to make and receive calls using the vehicle's built-in controls. The interface allows access to your mobile telephone's phone book and call lists for quick dialling. In cars with a satellite navigation system installed, additional functionality like direct number dialling, phone book display, phone book search can be performed.