| 摘要 |
<p>A burglarproof device which can facilitate the activation of an alarm system and can provide lock-out protection. It uses a set of correct-signal generating reed switches and a set of incorrect-signal generating reed switches to activate the alarm signal, and the input of a correct signal within the preset lock-out time after receipt of an incorrect signal will not be able to open the door lock or disarm the alarm system.</p> |
