Huatai Ultrasonic Sensor Free Postage £14.95 SMT design Compatible with most car alarms LED alert Detects object movement Built-in quartz-controlled ultrasonic volumetric protection sensor Adjustable ultrasonic sensitivity click or call 01522 595858 see below for more information 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 Huatai Ultrasonic Sensor £14.95 UK Postage & Packing: FREE Overseas Postage & Packing: not available for this item, please contact us for info To pay by card click Buy Now or call us now on: +44 (0)1522 595858

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