This mobile dvr supports 4 channel cameras recording with optional video quality like 720P/960H/D1/CIF. It support SD card with maximum storage capacity of 256G. Built-in ultra capacitor used as backup power, when the device has sudden outage, the ultra capacitor will power on the device immediately to write all the recorded data into the SD card and then shut down the system. With this design you will not lose the key video even in an accident. It has VGA port for HD video output and it supports operating by USB wireless mouse which is fast and easy to set up the device. You can backup the video with USB drive from the USB port on the device. It works with wide voltage range 8-36V DC which is suitable for all kinds of vehicle. If you want the device keep working for hours after vehicle ignition off, you can set up it in the menu, and you don't need to worry it will run out your vehicle's battery because the device comes with smart power management system, when detected the battery's voltage is lower than the gaven value, the device will shutdown automatically and keep ultra low standby consumption (3mA). You can also set up the device to be on/off at the gaven time range, when it goes to the gaven time, the device will boot up and record, and then shutdown automatically after the time range. It has built-in 4G GPS and WiFi function module, which let you can view the cameras and track your vehicles from PC and cell phone in real time when the device connected with 4G network and you can view and download the videos from PC when the device connected with the server by WiFi network.