This is fully Arduino compatible RF (Radio frequency) shield, which can be easily connected with our Arduino board.
Here are 2 relays with protective circuit, so no need to take any other precaution. You can control the relays from the Arduino. By this Shield you can control any AC (Alternative current) load without any other circuitry.
There is a LED for every relay which indicate the relay status (ON/OFF). There are two, 3 pin green connectors as the relay connectors. With these connectors you need to connect the load. The connector's 1st pin is common, 2nd pin is NC (Normally close) and 3rd pin is NO (Normally Open). As these are 12V relays, you need a 12V power supply to operate them.
The main feature of this shield is you can control your load wirelessly. Here we put a RF receiver which you can control via a simple RF transmitter (also provided with the shield). The receiver contain Vcc, Gnd, Rx and antenna pin (Details are in the schametic). By this shield you can control your load like your home’s fan, light or Tv and etc.
Just put some simple code in your arduino board and use this shield to control anything you want.