| 摘要 |
An anti-theft alarm system includes a switch-detecting portion including a first switch and a second switch, a controller, a button for enabling the alarm system. If the portable computer is moved without deactivation of the alarm system, the second switch opens, causing a change of a voltage at the first switch which is detected by the controller, the controller thereby sends an alarm control signal to an audio system of the portable computer, and the audio system produces an audible sound for a theft deterrence effect.
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