| http://www.w3.org/ns/prov#value | - since it responds to any objects emitting heat, including small animals such as dogs and cats in addition to persons, erroneous operations frequently occur. [0014] There is also another method in which an infrared light source and a sensor for receiving infrared light are installed at an invasion path, and invasion is detected when the invading object 11 blocks off the light emitted from the light
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