| 摘要 |
An electronic device includes a radio frequency identification (RFID) reader and a controller coupled to the RFID reader. The RFID reader is used for detecting an RFID tag when a distance between the RFID tag and the RFID reader is within a predetermined range. The controller is used for enabling the electronic device to operate at an emergency mode when the distance between the RFID tag and the RFID reader is beyond the predetermined range. In the emergency mode, the electronic device is locked.
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