| 摘要 |
A two part security system has a portable tamper warning device, adapted to be co-located with a portable object, and incorporating a tamper sensor and an alarm able to be activated by tampering with the physical object; and a separate complementary portable device adapted to be carried by the owner of the physical object; wherein, the tamper warning device is able to detect the presence of the complementary device and is operable to prevent the alarm being activated when the complementary device is within range, but allows the alarm to be activated by a signal from the tamper sensor when the complimentary device is out of range.
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