... 3G Mobile DVR, 4 channel, GPS, 3G,WIFI 2.H.264 ,VOICE Talking 3.Sending alarm ... special for mobile dvr.l Built-in GPS, WIFI, G sensor, Gyro sensor optional.2 SD Card ... , Very good anti-vibrationl Remote voice communication to driver, Remote messages,Over speed alarml Remote PTZ controll ... to induce the vehicle X, Y, Z axis3G,WIFI Wireless transmissionBuilt-in wireless module optional. Such as ...