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I would be interested in purchasing between 500 and 15,000 car radar sensors that are even simpler than standard parking radar sensors. It should be a reliable radar system that can sense distances from about 7m down to about 30cm. Accuracy of 10cm is fine. As output, I would primarily like an audible signal, that I can feed into a car radio. This audible signal would have to vary, but be permanent and high-pitched at 30cm. At longer distances it should be lower-pitched and/or intermittent. The power source would be standard car power. Preferably, it would have three cables, ground, power, and audio.price, weight, and size is important.Sincerely,/ivo welchivo dot welch at xxxxx parking sensor, audible parking sensor