Flysky FS-i6S 2.4G 10CH AFHDS Touch Screen Radio System Transmitter + FS-iA6B Receiver Self Centering Throttle Mode DIY RC Drone Multicopter FPV (Left Throttle) Omni-directional gain antenna. Full touchscreen interface,more convenient to control. Bidirectional communication. Multi-channel hopping frequency. Note: if this transmitter bind with the fs-ia10b receiver,it can extend to 10 channel.