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GPRS online guard patrol control system Product Description The gprs online guards patrol inspection reader need to be installed a SIM card. When the device scans the tags, then the patrol information can be sent to the computer with GPRS immediately. Also gprs online guards patrol inspection reader is with Panic Button, when the worker have some something urgently, who can press the Panic Button. So, the computer will make a sound, and the officer will know that there is