Spektrum SLR300 3CH 2.4Ghz SLT Receiver SPMSLR300Spektrum DSMX SRXL2 Receiver w Connector Installed SPM4650C The SPM4650 DSMX SRXL2 Serial Micro Receiver takes the original SPM4648 receiver and adds more value, functionality and fly by telemetry, while decreasing the size and weight of the already micro sized Spektrum serial receiver. The SPM4650 uses our feature rich SRXL2 protocol to give pilots a blazing fast serial data connection with up to 20 channels. SRXL2 is a powerful communication