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Even the most average of homes has a long driveway, which means it is impossible or at least very difficult to see accurately who arrives at your home. Being able to see who drives up to your home can greatly improve the layer of protection for your home. That is the rationale behind so called driveway alarm systems.
The majority of driveway alarm systems operate by placing infra red sensors at certain primary parts of your home such as in the yard or in the driveway itself. The sensors are then connected to a transmitter that will send a signal to the receiver in your home. When a vehicle or a person steps through and thus breaks the beam, this will then send a signal to the transmitter. This in turn notifies the owner that someone is in the perimeter of the house. A magnetic sensor can be used to detect the presence of vehicles with a greater degree of precision.
Regardless of the actual method, such driveway alarm systems operate on one basic principle: they act as eyes and ears for the owner for areas where they can't see or be present in. It may be possible that a burglar knows about the sensors, but this can be easily remedied by using a motion sensor in tandem with the beam sensors. This set up has a wide area covered. The motion detector will be able to determine if there is an intruder even if the beam sensors have been overcome.
It is also possible for an extra fee for driveway alarm systems to come with an intercom. Another useful driveway alarm system is a video camera because this allows the homeowner the ability to readily identify a vehicle or individual outside. A video camera serves as both a deterrent and a remedy if the police has to be involved and the case is brought to court. Thieves do not like to be caught, and they do not like leaving evidence, so being filmed in the criminal act is a very potent deterrent indeed.
In case of a power shortage whether due to failure or to the intervention of the thief, most of these systems have a backup power supply. This is pretty much a standard nowadays with most security systems, including driveway alarm systems. However, make sure to check before actually buying a particular driveway alarm system. Also consider the features that come with the driveway alarm system. There are driveway alarm systems that you can install yourself, which is great if you want to save on installation fees.
Regardless of the technology involved and the effectiveness of the driveway alarm system in question, perhaps one of the most important, if not the most important, factor to bear in mind is that the driveway alarm system must be able to readily and accurately distinguish between different objects and not be too sensitive. It's the "boy who cried wolf" syndrome. If the driveway alarm system provides too many false readings then the system as whole is entirely redundant. Think about it. If you call the cops every time a squirrel moves across your lawn, what are the chances they are going to respond to your 911 call after the thirtieth time?