NorCross Marine Skier Alert SP Wireless water sport safety system watches for fallen skiers, wakeboarders, or tubers Features a 360-degree pivoting, waterproof base that you can easily install with suction cups on a boat's dashboard; wireless, 100-percent waterproof safety lanyard attaches to a skier's life jacket or belt Sounds a 100 decibel alarm should the signal be interrupted to alert the boat's driver or captain Built-in low-profile antenna and a polarized dot matrix liquid crystal display Base dimensions: 5.5 x 3.75 x 2.5 inches (Wx Hx D); lanyard dimensions: 3 x 1.5 inches (WxH); weighs 8.0 ounces