... 2.Dual SD cards slots, max 32GB each Digital video recorder h.264 dvr with 2 SD card supported GPS ... interface7. Black box for vehicles- record speed, position, acceleration,temperature, brakes, backing up, turns and alarms8. SD lock, industrial ... ~ 36VPower output4 channel DC12V 2AConsumption6W-12WDimension123mmx138mmx45mmNet weight0.9kgOperating temperature-25~ +85Note: GPS device is Optional!