Find your destinations, hotels, stores and more. The anti-glare screen is easy to see in the sun, the suction mount holds fast to the windshield, and the GPS chip picks up satellite signals even indoors. Built-in Bluetooth lets you use the c550 as a speakerphone. The music player can even read MP3s files that you put on an SD card. Plug into your car's stereo using a tape adapter or FM transmitter.