Down here in Florida, one of our nature tour boating programs has just replaced our required hand-held flares with a new Coast Guard approved battery powered device. Ths is a handheld LED SOS signal light which is Coast Guard approved. These area great improvement as they are much safer( no open flame), require only 3 C type batteries to operate, can last up to 60 hours with a ten mile range and do not have to be replaced every 3 years. It's made of a heavy duty platic with a clear top. You just twist the top to activate the light. I think they float as well.