Ultrasonic Sensor Usually a two-piece
electronic detector where two separate 'eyes'
are placed in the vehicle. One eye sends a
signal across the vehicle, creating an ultra
sound wave. If anything moves the wave it
will activate the system and the siren will
sound. Open sunroofs, windows, air vents,
pets left in the vehicle or the moving roof
of a soft-top vehicle may activate the system,
so care should be taken.
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| Hyperfrequency Sensor (Microwave)
The hyperfrequency is an electronic unit that
creates an invisible screen in the vehicle.
Penetration of this screen will activate the
system. The screen is not affected by wind
so is the ideal protection for soft-top vehicles. |
Level Reference Monitor (Tilt Sensor, Anti
Jacking Unit)
This unit can be referred to by either of
these names. Senses if the vehicle has moved
from the position at which the Level Reference
Monitor was set up. Ideal for vehicles with
alloy wheels as it will detect the vehicle
being jacked up at an angle and activate the
alarm. |