R4FGM V2.3 4 Channels Tiny RC Gyro Receiver for Mini RC Cars 1/28 and Boats, ...

R4FGM rc receiver suitable for ’s transmitter RC4GS/RC4GS V2/RC6GS/RC6GS V2/T8FB/T8S. R4FGM's gyro function is default OFF. Turn on the transmitter, then power on the R4FGM. There is a black button on the side of R4FGM, long-press the button for 1 second and then release, the receiver's light starts blinking, and will be always on after bind successfully.

eBay