This is a plug/play digital wireless unit. Each unit both transmits and receives and are interchangeable with others in your system. Two units are required to start going wireless one for the LCU and another for a PBU. This unit may be plugged into an standard hardwired WFX pad-box or launch controller to make it a wireless pad-box or controller. Multiple pad-boxes may be plugged into a WRU-c in order to piggy back off of its wireless communications.