WhistleSource Ultimate Equipment pg. 57, Adventurer's Armory pg. 19, Advanced Player's Guide pg. 183
Price  8 sp (signal), 9 sp (silent); Weight — (signal), — (silent)DescriptionWith a DC 5 Perform (wind instruments) check, you can use a whistle to signal the same sorts of situations as signal horns. A whistle’s piercing report can be clearly heard (Perception DC 0) up to a quarter-mile away. For each quarter-mile beyond, Perception checks to hear a whistle take a –2 penalty. Silent whistles that only animals and other creatures with keen hearing can hear also exist.
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