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Federal Signal's Model 253 is a unique backup alarm that samples the ambient noise levels surrounding the vehicle and adjusts its sound output automatically. By "listening" to the surrounding sound levels Model 253 will continuously adjust the output to provide 10dBA (+/-4) over ambient noise levels. This self-adjusting vehicular alarm provides just the right level of audible signal required to warn employees of an approaching fork lift or tow motor. The Model 253 emits sound at 80 pulses per minute and is polarity protected and will not operate when incorrectly wired.