Towallmark 7" HD Car GPS Navigation 4G 128M Touch Screen Multimedia Player Free Map Update Professional Navigation Program. Targeted Hign-sensitivity receiver module . average error within 2-5 meters. 7" HD Screen, Present the details Clear .You will not miss a turn! Hign Functional Muiltmedia Player . Support a lot of format . Built-in Hign-performence Li-ion battery.