| 摘要 |
There is described a car alarm (8) having a visible or audible warning means which is actuated by external or internal interference with the car, e.g. resulting in vibration on a drop in the voltage of the car battery, wherein the alarm (8) is adapted to lock on to a steering wheel (10) of the car, preferably to prevent turning thereof. Additionally, there is disclosed alarm equipment comprising: an internal power source (3); means (5) for comparing a first voltage, derived from a power source (1) of apparatus in which, in use, the alarm is installed with a second voltage derived from the internal power source (3); and visible or audible warning means (2) which is actuated in response to a difference between the said voltages as detected by the comparing means (5). <IMAGE> |
