Patented technology used by divers, Dive Masters, and Scuba Instructors worldwide. Get your dive buddy's attention -- fast & easily.
Just a simple shake sends sound up to 100 feet! No batteries! No maintenance!
Unlike simple "rattling" devices, the ACOU-STIK Professional Underwater Communicator stays silent while swimming & when stowed in dive gear or luggage. It only works when you want it to!