Futaba 4PM Plus 4-Channel Radio System | R304SB-E Receiver T-FHSS SurfaceOverview The Futaba 4PM Plus with R304SB E receiver is a complete 4 channel surface radio system featuring T FHSS technology and telemetry capability. This package pairs the feature rich 4PM Plus transmitter with the compact R304SB E receiver, providing reliable control and real time data feedback for cars, trucks, and boats. With mixing functions, model memory, and programmable settings, the 4PM Plus delivers advanced features at an accessible price