something like motion detecting alarm, or you can buy

来源: y2001 于 2008-12-10 09:48:40 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (111 bytes)
回答: there is a device, a small monitor using battery 由 y2001 于 2008-12-10 08:31:19

fake monitor to install outside the door, looks just like the real one. then write the note: you are monitored.

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