Use Multiple Flysky Receivers With One Transmitter
This Flysky receiver is convenient and cost effective since you don't need to keep multiple transmitters and receiver sets for all your cars. You can just install these receivers on your different RC cars and they can be paired up with one Flysky transmitter. Plug the receiver to the transmitter's binding port and press the pairing button. The receiver will then be paired up with the transmitter.
It is easy to use and is a good long term investment to keep spare receivers, since you can use them when you get additional RC cars. Just install a spare receiver to your car and you are ready to go out for a spin!