Wazoo SOS Micro Whistle

Meet the SOS Micro Whistle, an all-aluminum whistle, designed to minimize size, maximize output, and function reliably under the most extreme conditions. Attach it, stash it, or wear it, but make sure you bring it on every adventure since this durable micro whistle is actually designed with a hidden life-saving capability *hint* it's in the name *hint*. Specs Dimensions: 8.5mm Diameter x 43mm Long   (~0.33" x 1.7") Tested to Exceed 115dB All Aluminum Construction (No Plastic Here!) Wide Range of Function Starts Resonance at Low Flow (good for kids) and Can't Be Over-Blown (good for adults)