| 摘要 |
An anti-theft device suitable for monitoring a parked motor vehicle 12 comprises a monitoring unit 2, which may be remotely located from the vehicle such as at an owner's home 14. The monitor unit 2 is configured to transmit 4 a sensing signal to the vehicle and a responder 3 attaching to the vehicle for returning a signal. If the sensing signal is an optical beam, the responder may be a retro-reflective element 3 attached to the vehicle and may be preferably incorporated with a headlight unit 15. If the sensing signal is a radio signal, the responder may be a radio repeater and the responder may be coupled to an engine immobiliser. The monitor unit may by activated remotely and may have alarm means including a lamp, a sounder, and a telephone dialler. |
