The Coghlans Emergency Survival Horn is very loud! It operates with the simplicity of a mouth horn and blasts out audible sound up to 120dB. The membrane can be easily replaced with any thin flexible film. Comes with SOS printed on the body and a black break-away lanyard.Features:- Features a stone and twig guard to protect the rubber membrane and comes with a break-away lanyard. - Durable polypropylene construction floats and is easily seen with the blaze orange color