GoolRC Flysky FS-i6 AFHDS 2A 2.4GHz 6CH Radio System Transmitter for RC Helicopter Glider with FS-iA6 Receiver Mode 2 Reliable, interference free 2.4GHz AFHDS 2A signal operation. 6CH operation. Use only 4 * AA batteries for transmitter. Quick and extremely stable in performance. Simple binding procedure.