... 480Recording methodContinuous, Scheduled, Alarm7Data Storage& SecuritySupport 4pcs SD card(1-64GB/PCS)Video and audio data stored ... , QuadSearchSearch by Date/ Time List10Software UpgradeUpgrade with SD Card11OSDOverlay time/date/VIN12Alarm InputExternal Alarm Input2channels13Addition FunctionGPS ... , FCC, RoHS Certification ISO9001:2008 Certificate 256GB RAM MPEG4 6-CH SD Card DVR For Car Monitoring