The Skier Alert SP utilizes patented MarineLink® Technology to closely monitor a Skier, Wakeboarder, Tuber, etc, and even doubles as a man overboard detector. When the Wireless Safety Lanyard is attached to a life jacket or belt the Base Station will immediately sound when the signal from the Lanyard is broken or submerged in water. To Use: Attach the display to your dash using the Base Stations’s integrated suction cups. Attach the Wireless Lanyard to your belt (clothes or life jacket) and activate the power switch. The dash mount Base Station will monitor the Wireless Lanyard and instantly sound a 100dB alarm if the signal is broken alerting you of a fallen skier, tuber, wakeboarder, etc or a man overboard..