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The Hubsan Replacement 2.4GHz Receiver Board for X4 H107C Quadcopter is a 2.4GHz air-end receiver (RX) for the X4 H107C palm-sized RC quadcopter. The purpose of the receiver is to allow the transmitter (TX)--that is, the hand-held controller--to communicate wirelessly with the aircraft. In most cases the receiver comes pre-installed and this will function as a replacement part, however it can also be used by model builders who want to build their own X4 from scratch.