Outdoor Camping Double Tube High Frequency Survival Whistle Self-defense Tools Specifications: Can be used as the key chain or a pendants ornament for your handbags. Twin tube high-frequency whistle is a good helper for outdoor articles, compact and easy to carry and convenient, cavity-free beads design, under-water can also be used. Item Name: Outdoor Survival Whistle Material: Aluminum Alloy Features: Twin Tubes, with Hanging Ring, High-Frequency Size: 5.6cm x 1.5cm/2.20 x 0.59 Approx. Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1 x Outdoor Survival Whistle