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2. Federal Signal Modulator - Wikipedia

   en.wikipedia.org/wiki/Federal_Signal_Modulator

   The Modulator has a similar setup to the Whelen WPS 2700, 2800, 2900, and OmniAlert omnidirectional speaker arrays. The Whelen arrays have single driver cells, [3] while Modulators have multi-driver cells. The American Signal I-Force siren, which uses stacked, elliptical speaker cells that provide omnidirectional sound output, is also similar ...

3. Siren (alarm) - Wikipedia

   en.wikipedia.org/wiki/Siren_(alarm)

   In Germany and some other European countries, the pneumatic two-tone (hi-lo) siren consists of two sets of air horns, one high pitched and the other low pitched. An air compressor blows the air into one set of horns, and then it automatically switches to the other set. As this back and forth switching occurs, the sound changes tones.

4. ATI HPSS - Wikipedia

   en.wikipedia.org/wiki/ATI_HPSS

   Arnold, Missouri 7 ATI HPSS32 units which replace the old Whelen WPS 3016 Sirens. [2] Ketchikan, Alaska maintains a system of 3 ATI HPSS32 units which are tested audibly on the 15th of the month at noon. These sirens are used to warn for tsunamis or in the event of a dam failure. [3] [4] Hudson County, New Jersey has an unknown number of HPSS ...

5. Air horn - Wikipedia

   en.wikipedia.org/wiki/Air_horn

   An air horn consists of a flaring metal or plastic horn or trumpet (called the "bell") attached to a small air chamber containing a metal reed or diaphragm in the throat of the horn. Compressed air flows from an inlet line through a narrow opening past the reed or diaphragm, causing it to vibrate, which creates sound waves .

6. Horn for iPhone: A diamond in the rough ready for extraction

   www.aol.com/news/2012-08-16-horn-review.html

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7. Vitamin D not recommended for preventing fractures in older ...

   www.aol.com/vitamin-d-not-recommended-preventing...

   The U.S. Preventive Services Task Force released a draft recommendation advising against using vitamin D to prevent falls and fractures in people over 60. Pharmacist Katy Dubinsky weighs in.