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Are you a diy guy?
Hella 3AG 003 399-801 Supertone HighTone/Low Tone Kit – 12 V used to make a car horn sound like an 18 wheeler.
Arduino type board,small 12 or 16 key, keypad, either or both infared and/or ultra sonic type sensors, and relay or motor control board. 12V power supply. (requires familiarity with C/C++ language, a little soldering, wiring, etc) These provably have 10 to 20 ft sensing range)
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drew1
wife has 924 turbo
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