The Fox 40 Micro Marine Whistle, 2-Pack is the recommended choice by outdoor enthusiasts, adventure guides, hikers and cyclists. The innovative ergonomically-designed Fox 40 Pea-less Micro Whistle is a technical marvel! Compact, small and flat, this 3-chamber 110dB whistle has no pressure points. The Micro Marine whistle has no metal parts to rust or corrode. The Micro is resistant to ultraviolet and saltwater. Fox 40 Marine products deliver outstanding performance in all types of watercraft applications and water sport activities wet or dry, depend on Fox 40! Whistle comes equipped with a split ring and safety neck lanyard that releases with tension 36" (91.4cm) in length. Fox 40 lanyards are now 3/16" (5mm) rope-style, woven with the Fox 40 brand. Lanyard includes J-hook and button style spring loaded adjustable cord lock. Micro Dual Pack includes two Micro Marine Whistles and Breakaway Lanyards. Whistle is available in multiple colors.