| 摘要 |
<p>Apparatus for controlling operation of an electrical device in dependence upon whether or not a location is occupied by at least one person, comprising means for detecting entries and exits of a person or persons to and from the location; means for counting the detected entries and exits to determine whether there is any occupation of the location; and means for providing a signal to control the electrical device according to whether or not the location is occupied.</p> |
