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In page Civil defense siren:
"As with electromechanical sirens, there are both omnidirectional, directional, and rotating categories. Whelen Engineering produces sirens which oscillate through 360 degrees, rotating in one direction and then in the other to allow a hard-wired connection between the amplifiers and the siren drivers.[4] These sirens can also be set to rotate any amount from 0 to 360 degrees, allowing sirens to broadcast only in certain directions.[citation needed]
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