The SA500SP can only be used with one lanyard powered on at a time. The base station and lanyard establish positive communication when the skier is up, when the lanyard enters the water the communication is broken causing the alarm to sound. If the base station is still communicating with a second or third lanyard the alarm will not sound and the driver will not be alerted to the first skier in the water. Additional lanyards can be purchased for the purpose of installing on multiple vests to be used one at a time by calling 1-888-766-7276 or emailing firstname.lastname@example.org .
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