| 摘要 |
<p>A security device (10) adapted to be located within premises under surveillance and with a form of access from the exterior of the premises can be actuated by a person carrying out the surveillance, includes means (13) which can be actuated by such person and the actuation is stored in the device (10) and can be selectively displayed on a screen (20) at the interior of the premises. The device (10) may have an infa-red sensor (13) located within a window (12) or the like and the person carrying out the surveillance may have an infa-red transmitter (16) whereby the sensor can be actuated. <IMAGE></p> |
