The Surviver Outdoors Longer Rescue Floating Whistle 2pk can be heard on the water or on land. Made of durable, corrosion-resistant ABS plastic and a pea-less design, this whistle is weatherproof and wont jam. The bright orange color is highly visible and easy to find in your gear bag or on a PFD. Use the attachment loop or secure to a lanyard to keep it within easy reach. This high-decibel, dual-tone whistle ensures your signal will be heard near and far by creating high and low frequencies.