... SD cards slots, max 32GB each Digital video recorder h.264 dvr with 2 SD card supported GPS Wifi optional ... / 4 HD1 / 4CIF), GPS module optional2. H.264 video compression, Linux operation systems, dual streaming3. Digital timestamp, motion detection4 ... speed, position, acceleration,temperature, brakes, backing up, turns and alarms8. SD lock, industrial grade design for vehicle use Specification ...