These receivers fill the last gap in Duplex receiver line and they are designed mainly for big and huge RC planes. We can see effort to make it as safe and reliable as possible. After the first insight into the receiver we can see that they did not only add more output connectors and pushed up the price. The only difference between R14 and R18 is the number of output channels. Other functions are the same thus the text bellow is written only about 18 channel receiver Duplex R18.