5 channel radio remote control circuit based of TX-2B / RX- 2B pair
Amazon.com: XIDAJIE 4CH Remote Control 27MHz Circuit PCB Transmitter Receiver Board for RC Car : Toys & Games
Electronic Spices 4CH RC Remote Control 27mhz Circuit Pcb Transmitter & Receiver Board With Antenna Radio System for Toy Car 101 : Amazon.in: Toys & Games
Simple RC Cars - Single channel Transmitters and Super Regenerative Receivers at 27 MHz and 49 MHz
4CH Remote Control 27MHz Circuit PCB Transmitter Receiver Board for RC Car - Walmart.com
Simple RC Cars - Single channel Transmitters and Super Regenerative Receivers at 27 MHz and 49 MHz