Whistle No. 5H Acceptable for use on Coast Guard certificated vessels of 75 to 200 meters in length. Hear it! (pc) | Hear it! (mac) | Hear it! (realaudio)     Specifications Free air consumed (cubic ft./sec.)   1.40 Net weight (lbs.) 53 Frequency cycles/sec. 195 Line size 3/4" db at 25 ft. 123 Audibility Distance Rating* 2 3/4 - 4 miles * Per Coast Guard Rating Method
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