The heart rate monitoring kit is a piece of equipment from water rower that will help sense your heart beat when your are rowing this machine does this using a chest strap to monitor the heart and then the receive will put this information on to the screen so you can see it while you workout this is the ant which is the newest heart rate monitor and recommended for anyone with a s4 monitor by water rower key features of the water rower heart rate monitor one size fits most adjustable stra