| 摘要 |
An advertising device for use in retail outlets, including a passive infra-red sensing system, a sign bearing a message. and signaling means by which the attention of persons in the vicinity can be attracted, wherein the presence of persons in the vicinity may be detected by the sensing means and said signaling moans may be activated to attract attention to the sign, and including a motion-sensitive switch to activate an alarm if the device is moved and/or an external programing means which can be plugged into the apparatus to reprogram it.
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