| 摘要 |
<p>Warning device for warning of the absence of activity in households with a single occupier whose main purpose is to draw attention if after a preset period of time has elaspsed no movement has occurred within its protection zone, characterised in that it comprises a motion detector (1) operatively associated with a timer (2) and an alarm switch (3), said timer being set to a time delay proportional to a normal sleeping time, said timer actuating an interior alarm (5) if said motion detector (1) has not sensed any movement in its protection zone (4) once said time delay has elapsed, said interior alarm (5) actuating an exterior alarm (6) via telephone or sound alarm if it has not been switched off within a short predetermined period of time, said exterior alarm (6) ringing on until somebody enters said protected zone (4), and wherein said timer is automatically reset each time the motion detector (1) senses a movement.</p> |
