GPS tracking system for prisoners(ankle wrist gps tracker for prisoner offender) uses the efficient Nucleus operating system, uses Qualcomm communication chips, built-in Beidou/GPS positioning system, 4G network communication module, camera and health monitoring functions, etc., uses electronic pulse tamper-proof TPU material strap, high strength，Each bracelet has an independent IMEI number for identification, which is bound to the information of the wearer of the bracelet. When the bracelet is activated, the positioning information, alarm information, and health information will be uploaded to the server, and the supervisor can view the relevant information of the staff in real time through the Web terminal and issue instructions from the opponent ring，The bracelet it is widely used in the attendance of outside supervision and special supervision. Trajectory tracking of the crowd, automatic entry and exit management, etc.