| 摘要 |
This system comprises of two co-operating components, one a signal receiver 1, which is incorporated into a protected item. And the second, a transmitter 2 which is separate from the first component. It can be made into a key-ring, which when separated by a certain distance the theft deterrent device becomes operational. For example, a man using an electric drill puts it down and walks away from it a certain distance, the receiver 1 stops receiving a signal from the transmitter 2. The alarm is automatically activated so when a thief picks up the drill, the alarm goes off and will keep going off. Even if he manages to steal the drill he can never use it again, as it will cut out the system and can only be used if the transmitter 2 comes back into contact with the receiver 1 within a set distance and then everything becomes operational again. |
