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Frequently Asked Questions

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What is the difference between the Models S-80, S-120, S-120C and S-135 Interstate?

A. * The S-80 is an 80 dB unit with a wave carrying length of approximately 1,000 feet.
* The S-120 and S-120C are 120 dB units with a wave carrying length of approximately 1,600 feet.
* The S-135 is a 135 dB unit with a wave carrying length of approximately 2,000 feet. Because of its power and range, the S-135 is designed to be used on interstate highways and rural high-risk areas only.

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