Specifications: The whistle is designed to give you the best chance for survival in a disaster or lift-threatening situation. With the unique sounding chamber, you will save 30% of the effort than an ordinary whistle. The whistle is an essential piece of safety equipment to have on you during outdoor activities. High decibels to attract the attention from others and improve rescue possibility. Suitable for outdoor sports, camping, hunting, survival and so on. Item Name: Whistle Material: Stainless Steel + Zinc Aluminum Alloy Features: Dual-Pipe, Portable, Keychain Design, Safety Tool Whistle Size: 5.6cm x 1.95cm x 0.7cm/2.20" x 0.77" x 0.28"(Approx.) Total Length: 9.7cm/3.82" (Approx.) Notes: Due to the light and screen setting difference, the item's colour may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Whistle