... model design, hardware dog internally installed, ensuring stable running of system, and support video, data business, AV synchronization and two way ... ;1 route RS-232 ,1 route RS-422,1 route loop connection of electricity;4 USB2.0 1 USB1.1 data ... districts can be suitable, debugged for completion. AccessoriesCD including installation system and instruction manual,1 net wire, remote control unit,3G ...