The StreetPilot c320 GPS Navigator from Garmin features a simple touch-screen interface, with automatic route calculation to any destination and turn-by-turn voice-prompted directions along the way. You can easily choose your destination with minimal amount of input from your side. It allows you to choose between a three-dimensional navigation view or the more traditional 'birds eye' overhead view. The StreetPilot c320 features an SD card slot, a 128 MB SD card, and MapSource City Navigator street data on DVD. Featuring a bright, 3.5-inch diagonal, 16-bit color display, the StreetPilot c320 makes navigation a snap. With the POI Loader software, you can import points of interest, upload safety cameras or school zones and more. This device also features dual integrated speakers for high-quality voice prompts, and an internal lithium-ion battery for out-of-car route planning. It is secured by a suction-mount cradle that fastens to the windshield for easy portability between vehicles. The StreetPilot c320 boasts distinctive and sleek only buttons are a rotary volume knob and an on/off switch.