DTXMX Flysky FS-i6X 6CH RC Transmitter and Receiver FS-iA6B 2.4GHz Radio Controller for RC Helicopter Quadcopter FPV Racing Drone Car Boat

Multi-channel Hopping Frequency --- This system bandwidth ranges from 2.408GHz to 2.475GHz. This is divided in 135 channels. Each transmitter hops between 16 channels (32 for Japanese and Korean version) in order to reduce interference from other transmitters.
Unique ID Recgnition System --- Each transmitter and receiver has it's own unique ID. Once the transmitter and receiver have been paired, they will only communicate with each other, preventing other systems accidentally connecting to or interfering with the systems operation.
Bidirectional Communication --- Capable of sending and receiving data, each transmitter is capable of receiving data from temperature, altitude and many other types of sensors, servo calibration and i-BUS Support.
Omni-directional Gain Antenna --- The high efficiency Omni-directional high gain antenna cuts down on interference, while using less power and maintaining a strong reliable connection.
Low Power Consumption --- The system is built using highly sensitive low power consumption components, maintaining high receiver sensitivity, while consuming as little as one tenth the power of a standard FM system, dramatically extending battery life.