The ultrasonic sensor works on the same principle as police radar. A transmitter produces ultra high frequency sound waves, which bounce off all surfaces inside the vehicle. A receiver then picks up the reflected sound waves and sends a trigger signal to the connected alarm when a change in the shape of the echo is detected. Ultrasonic sensors require a rigid, stable perimeter with no air movement, i.e. convertibles will not reflect sound waves and soft-top roof's will move when battered by the wind
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