... Mobile DVR, 4 channel, GPS, 3G,WIFI 2.H.264 ,VOICE Talking 3.Sending alarm ... .l Built-in GPS, WIFI, G sensor, Gyro sensor optional.2 SD Card slots optional,VOIPl ... induce the vehicle X, Y, Z axis3G,WIFI Wireless transmissionBuilt-in wireless module optional. Such ... after the outside power offSecurityPasswordUser and Admin, 2 levels password managementWorking EnvironmentTemperature-20 to +70Humidity20% ...