Blue card (Patrol) electronic patrol system is mainly used for security patrols inspection and inspection records of the work of assessment, the patrol system software, inspection devices and a variety of RF card form. The basic principle is to install a series of patrol routes represent different points of the RF card (also known as proximity cards), patrol officers to patrol the point of inspection by handheld devices (equivalent to credit card machine) card, to represent the point same card number and the time recorded. Patrol inspection device after the data passed through the communication line treatment of computer software to connect to the patrol situation (location, time, etc.) for recording and assessment.