Specifications: -big screen manifestation of colorful LCD. -can move and show the screen at any angle. -work voltage with breadth scope. -ic card identify confirms and inputs. -can give alarm when the driver exceed the speed an time limit. -super capacity of data storage lasting long time. -with bright appearance design of our owe patent. -has the pit to carry the function only. Strong function to expand the space. Easy understanded trouble doubtful point analysis curve diagram. Easy operation system management software with amity interface.