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The Autotether boating safety device is an unobtrusive wireless unit that clips into the ignition switch. It operates via a transmitter that sends radio waves to a receiver connected to the boat’s ignition. When the sensor is submerged in water, the signal between the transmitter and the receiver is instantly broken, and Autotether activates the ignition kill switch. The unit can accommodate a total of four wireless sensors. Any passenger wearing the sensor who falls overboard will signal the boat to stop with the sound of an alarm. For added safety, should the operator or a passenger notice a potential danger, the red alert button located on the sensor can be pushed to sound an alarm and stop the boat. Autotether can be transferred from boat to boat with the proper clip. It also can be used to monitor a water skier or a tuber with the alarm only and not shut off the boat if he or she goes in the water. The kit includes one ignition switch clip, one transmitter, two personal sensors and two AAA batteries and costs $295. Additional personal sensors cost $69 apiece. autotether.com // (888) 593-4181