This pair of receiver. transmitter modules are very useful for short distance (~5-6 meters) wireless data transmission/ reception and control. These modules provide a low cost mean of adding wireless feature into your electronic products. They work on 433 MHz carrier and uses ASK digital modulation technique to stream data over 433 MHz carrier.
You may require Encoder and Decoder circuits like HT12D/ HT12E in order to design a multiple transmitter/ receiver system. One may also use them to transmit/ receive UART serial data directly from microcontroller. Add a small piece of 22 SWG Hook Up wire to the ANT (Antenna) terminal of Tx/ Rx Module.