Features:

• Acou-Stick underwater noise maker.
• Compact 6" long fits easily in BC pockets.
• Extra-long 12-inch wrist/BC strap, made of super-soft braided nylon.
• Fluorescent-green color for extended visibility the perfect accent to today's dive gear styles.
• Virtually indestructible constructed of high-impact, high-strength structural polymer.
• Near-neutral buoyancy (just a little over one ounce negative) for very comfortable carrying.
• Size: H 6 1/8" x D 1 6/8"

Description:

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!