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4 Channel Relay and Xbee Shield For Arduino is capable of controlling 4 relays. The max switching power could be 250VAC/3A or 30VDC/3A. 4 Channel Relay and Xbee Shield For Arduino can be remotely controlled, making it easy to use in robotics, industry control and smart houses. It can be controlled by directly using Arduino and remotely, using Xbee socket (zigbee / bluetooth bee) or using 315/433 MHZ RF module.