FlySky FS-IA4B 2.4G 4CH Receiver Support Data Backhaul PPM Output iBus Port for FS i4 i6 i10 iT4S Transmitter RC Car Boat RF Range: 2.4055-2.475GHz Size: 35.4*29.6*13mm ANT Length: 26mm 2.4G System: AFHDS2 RX Sensitivity: -105 dBm