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Lv 7
Diana asked in Science & MathematicsEngineering · 1 month ago

What's the least expensive ultrasonic sound device?

2 Answers

  • 1 month ago
    Favorite Answer

    Least expensive?  Probably a dog whistle.

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  • 1 month ago

    Electronic screamer for mosquito,dog,bird,insects is the most less expensive ultrasonic sound device, sold for just a few dollars each.

    • Diana
      Lv 7
      1 month agoReport

      I couldn't find one.  Please tell me where to buy it.

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