Sonic Blast Horns are a great option for uses where flammability is a concern including industrial safety, construction sites, confined spaces and boating. Portable 1oz size has a Velcro strap that can easily be attached to a belt, belt loop or backpack. Provides a piercing 112dB blast at 10 feet. Meets US Coast Guard requirements for boats up to 39′ (12 meters). Provides up to 12 blasts per can.