Voice activated DVD based GPS guidance system allows you to enter destinations by touch screen or voice commands. Prius models with navigation are easily identified by the 4 hard buttons on the left and 3 on the right of the (MFD). Units that are not equipped with navigation only have 2 buttons on either side. There will also be a fourth cluster of buttons on the upper right section of the steering wheel to initiate voice commands, toggle the info screen and answer calls via Bluetooth. There is also a DVD player under the driver seat that reads the map disc (DVD). There are many aftermarket options available for any Prius that does not have this feature.