HJ DJI Phantom 1 & 2 Remote Controller Signal Amplifier Expansion Booster Device To Extend Quadcopter Flying Distance Range DJI RC Radio Control Transmitter Signal Amplifier in Compact Size Increase the range and reliability of your 2.4G radio system, especially for FPV application Remote Transmission Range can be enhanced more 3600 Meters Built-in high-speed transceiver is switched automatically determine the circuit automatically 2.4G model can be applied to the remote control, wifi routers , Neccessary Tool for 2.4Ghz FPV Equipment