| 摘要 |
<p>An alarm device, said alarm device comprising a portable housing (1) containing an arming and dis-arming arrangement, and an alarm signal generator (8), and a switch (6), closure of the switch serving to actuate the alarm signal generator when the device is armed, the switch being adapted to be closed when part (5) of the device on the exterior of the housing is permitted to move away from the rest of the housing, said arming and dis-arming arrangement comprising means (7) adapted to receive and respond to a predetermined arming signal to arm the device and a predetermined dis-arming signal to dis-arm the device, the arming and dis-arming signal being transmitted to the device from a position (10,16) remote from the device.</p> |
