This is the Futaba R614FS 2.4GHz FASST 4-Channel Receiver and is intended for use with the Futaba 4PK and 4PKS Surface Radio Systems. Features:
Futaba's FASST (Futaba Advanced Spread Spectrum Technology) shifts very quickly virtually eliminating signal conflicts and interruptions unlike other 2.4GHz systems that only stay on one or two frequencies. Small and lightweight