3.5 inch GPS navigation MP3/4,Ebook,photo viewer Win CE 5.0 system Support SD card 20 country language 3.5 inch ... WinCE net 6.0 Operating system Built in GPS antenna and it also can connect external antenna Functions: Navigation, MP3, MP4, JPG picture ... .90WinCE net 6.0 Operating system Built in GPS antenna and it also can connect external antenna Functions: Navigation, MP3, MP4, JPG picture ...