| 摘要 |
PURPOSE: A security alarm device is provided to secure safety without an additional sensor. CONSTITUTION: A security alarm device includes an attaching unit(1), a support unit(2), and an alarm unit(3). The attaching unit is attached to a wall near an entrance door. The support unit connects the attaching unit. The alarm unit is connected to the support unit. [Reference numerals] (1) Attaching unit; (2) Support unit; (3) Alarm unit; (AA) Entrance door; (BB) Entrance
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