8 Pcs whistle emergency survival, Double Tubes Loud Whistles, Aluminum Alloy Whistle Key Chain for Kayak Life Vest Jacket Boating Fishing Boat Camping Hiking Hunting Rescue Signaling (combination)

Mix and match color at will: Reminds the number of color Applicable scenarios: running sports, fitness equipment, health massage, fitness body, chess and entertainment, music instruments, sports trends, cycling sports, ice and snow sports, extreme challenges, hiking climbing camping, shooting sports, martial arts defense, sports protective accessories, dance, dance Sports, foot baskets, venue entertainment equipment, sports outdoor bags, fishing sports, ping -pong feathers tennis, other ball movements, swimming and wading sports Color: silver, gold, black, purple, red, green, blue Name: High -frequency dual -tube survival whistle Material: Aluminum alloy material, plastic core Weight: about 13.5g Packing: OPP bag independent packaging Peak volume: about 120dB Surface treatment: oxidation+sand spray Specification: 55mm × width 15mm × thickness 8mm Scope of use of survival whistle: Survival whistle does not have to be used when encountering danger. For example, say hello to the front and back to determine how far away is to determine which direction of the other party's voice source.