1.4 channel car DVR , support max 64 GB sd card 2.Front ,sides ,back ... the outside view and inside people during the Car.Embedded Linux operating system car DVR ,using H. 264 format, compression ratio, the ... connector), 1 channel audio output ;. Built-in GPS, Built-in wireless module like 3G (EVDO, WCDMA,HSPA, HSDPA, TD-SCDMA…), GPRS ... screen shot 4 channel full views 3g gps optional car dvr