No set up required Mix two channels Extremely small size 100% Waterproof The VTail mixing module is designed for use in RC models where you want to mix two seperate signals such as throttle and steering. It is ideal for model boats that have two motors and no rudder. The mixer module is easy to connect up and allows you to use your transmitters throttle and rudder/steering chanels to operate your model by mixing the signals to each speed controller/motor to speed up or slow down to give steering effect. All Mtroniks mixer modules are 100% waterproof.