The Spektrum SPM9747 DSMX SRXL2 Remote Receiver is used to provide additional path diversity using Spektrum's patented MultiLink technology to avoid reflected signal fading and polarization blind spots at long range from the transmitter. The Spektrum SPM9747 SRXL2 is compatible with all receivers that utilize SRXL2 remote receivers (4-pin connector). It features an integrated antenna design inside the case to provide easy installation and worry free performance.