The Relay shield is capable of controlling 2 relays. The max switching power could be 10A/250VAC or 10A/30VDC. It could be directly controlled by Arduino/Freaduino through digital IOs with external 9v supply. With built-in XBee/BTBee type socket, it can be wirelessly controlled via XBee/BTBee. Make it an ideal solution for home automation and robotics purpose.