Mount these remote communications marine speakers where you can hear them, and keep your VHF radio in an out-of-the way location where it won`t get wet. In addition to protecting your radio, VHF extension speakers add safety. Mounted at shoulder level, an extension speaker eliminates crouching over the radio to hear it, permitting greater visibility and more comfortable piloting. And they make it easier to hear faint broadcasts and distress signals. Stainless steel grilles, sturdy plastic frames, polypropylene speaker cones and teflon-coated wires are completely waterproof and corrosion-proof. Each extension speaker comes with a two year warranty. 2-1/2" x 2-1/2". #MB21.