herchr sd Card Vehicle 720P AHD GPS 4G 4ch sd Card Vehicle Mobile dvr with Hisilicon chip

Power:
  Professional In-Vehicle power design, 9-32V DC Wide Voltage Range
  Multi protection circuits like under-voltage, short, reversed plug-in
  Smart power management system, shutdown under low voltage, low consumption when standby
Data Storage:
  Special file management system to encrypt and protect the data
  Proprietary technology to detect the bad track of the SD card which can make sure the continuity of video and long service life of the SD card
  Built-in ultracapacitor, avoid data loss and sd card damage caused by sudden outage
  Support SD card storage, maximum 256G
Transmission Interface:
  Support GPS/BD optional, high sensitivity, fast positioning
  Support wireless download by WiFi, 802.11b/g/n, 2.4GHz
 Support 3G/4G transmission, LTE/HSUPA/HSDPA/WCDMA/EVDO/TD-SCDMA
SD card installation
Please insert the SD card and SIM card into the slot as per the icon indication, Then close the SD cover and lock it (Please remember to lock it, otherwise, The SD card will not work)
Antennas Connection
Please connect the WiFi and GPS antennas as per the picture as followed. We suggest you put the GPS antenna externally at the vehicle?s roof to make sure signal connection even when it is weak.(Wifi function is optional)
Power Connection.
The yellow ignition wire is used to detect the ignition signal. We strongly suggest you connect it with the ?RUN? terminal of the ignition switch, or any terminal in the vehicle?s switch box which will have power only when the vehicle was ignited (f.g. the FM radio)