Navtour NT-147 Portable GPS Navigation System with 3.5-Inch LCD Navtour NT-147 Portable GPS Navigation System General Features: GPS Navigation System MP3 music player Photo viewer Voice recorder Alarm clock 3.5-inch high resolution color TFT touch screen display SD memory card expansion slot High-sensitivity integrated GPS receiver by Centrality NAVIGON navigation system Preloaded with detailed maps of U.S. Canada on 1 GB SD Card