This DFRoobot Relay Shield V2.1 is a completely new design which is capable of controlling 4 relays at a time. The max switching power could be DC 90W or AC 360VA. It could be directly controlled by Arduino/DFRduino controllers through digital I/Os with external 9V supply. With built-in Xbee socket, it can be wirelessly controlled via Xbee/bluetooth/WPM.
This relay shield is an ideal solution for home automation and robotics purposes.