Shaluoman 2.4G Radio Signal Amplifier Booster For Phantom Transmitter TX Black Fit DJI Phantom Transmitter. Suitable for 2.4G radio system and 2.4G launch receiving equipment, like WIFI Router . Custom made 2.4G radio signal amplifier, especially designed for long range application like FPV. High speed receiving and transmitting auto-switching circuit, can switching between receiving and transmitting modes automatically.