a simple RF Transmitter-receiver module , Which is used in Remote control for cars , or to control simple tasks , like control relay on/off.

2 x Arduino UNO or compatible boards Breadboard Wires RF Module (433 Mhz) - Transmitter and Receiver pair or the 315 Mhz version

The receiver has 4 pinouts :

GND
VCC(3-5V I think) but I used 5V.
2 DATA pins.

The transmitter has 3 pinouts :

 GND
 VCC   
 DATA
 
 A picture is provided.

RX:

GND <--->GND VCC <---> 5V DATA(next to VCC) <--->pin 11 the other pin shouldn't be connected.

TX:

GND <--->GND VCC <---> 5V DATA <--->pin 12

    http://www.instructables.com/id/433-MHz-Coil-loaded-antenna/