Description: Portable Mountain Outdoor Survival Emergency Whistle Features: 100% Brand New and high quality. Self-defense equipment supplies loud whistle whistles aluminum whistle lifesaving whistle train whistle Contact with peers in the wild, danger, accident needs help a little whistle to help a lot. Can be hung on your backpack, or hang on a key ring, very fashionable and practical! Easy compact and easy to carry, cavity-free beads design, water can be used. Help to contact with each other in the wild, in danger, accident needs help, a little whistle could do big thing. Such as SOS, you need whistle-blowing "three times short, three times long, and three times short” Specification: Condition: Brand New Material: Aluminum alloy Color: Gold, Silver Size: 56 x 15mm\/2.20" x 0.59" Weight: 12g Package includes: 1 x Whistle Details pictures: