| 摘要 |
A device for protecting property from predators without a physical barrier or obstacle to entry. The device includes a plurality of warning elements and at least one motion sensor. The sensor is configured to initiate a systematic escalating sequence of activation of warning elements responsive to detection of a predator within a predetermined range. A preferred embodiment has a first protection stage including activation of a first warning light element in a flash pattern, and activation of motion sensors. A second protection stage, including bright illumination by a second light element, is initiated by the motion sensors in response to detection of a predator. Motion sensors either initiate a third protection stage, including emission of a sound by a third warning sound element in response to continued detection of the predator or deactivates the second tier warning lights and returns the device to the first protection stage.
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