Hxst Portable Brass Whistle with Key Ring,Emergency Whistle,Survival Whistle,Perfect EDC Tool Durable - Made of superior brass Portble - You can put it in a bag and pocket,or hang it on a keychain and backpack zipper with the key ring Beautiful - Scrub and polishing process gives it a extreme visual effect Loud - Double tube design can make sounds up to 118 decibels.You can save 30% energy than normal whistle when you get the same db Multi Purpose Whistle - Perfect For Referees Officials Coaches,Training,Sports,Teacher,Lifeguard,Life-saving ,Protection,Hiking,Camping,Wilderness survival,Emergency,etc