The REI Tri-Power safety whistle is an essential piece of safety equipment to have on you during outdoor activities. 3-chamber design produces different pitches and blasts up to 120 decibels. Made of high-visibilty, non-corroding ABS plastic for durability. Whistle features a hands-free mouth grip. Metal clip with key ring allows you to attach the whistle to a PFD, pack or jacket. Safety whistle meets U.S. Coast Guard and Safety of Life at Sea SOLAS requirements also meets anti-choking standards for children.