FLYSKY FS-I4X 4CH 2.4GHZ RADIO SYSTEM With A6 RECEIVER MODE 2With strong initiative and passive anti interference ability and V MIX mix control system,compatible with many models. According to your own needs,you can DIY expansion channel,this item can be expanded to 10CH. Works in the frequency range of 2. 405 to 2. 475GHz. This band has been divided into 140 independent channels. This radio system uses a high gain and high quality multi directional antenna,it covers the whole frequency band. Associated with a