1,Auto accessories electronics GPS navigation 2,For universal cars, 3,6 inch Touch screen, 4,MP3/MP4, FM transmitter Welcome to use ... and AV-In Function (Optional) Remark 1:Bluetooth+$3.5,AV+$1.6, 128MB+$1.6Remark 2:Bluetooth needs 128MB (WITH FM ... navigating serviceEntertainment: MP3 and MP4 function can relieve your fatigue 6 inch car GPS navigation