The present disclosure provides details of a system and method for a communication device for guards in a controlled environment. The communication device is established based on a wireless infrastructure in the controlled environment, receiving wireless positioning signals to calculate and determine the real-time location of personnel carrying the device. The indoor wireless positioning can be combined with other available positioning methods to provide highly accurate positioning information of the personnel. The communication device detects and records activities of the personnel during a period of time, and is controlled by the control center. The status of personnel is monitored by control center. Meanwhile, the communication device has AR functions that allow physical objects and augmented reality element to be displayed to the personnel at the same time. The personnel can thus have improved awareness of the surrounding environment and can respond to various potential dangers more effectively.