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If you need the soft and C++ code to control this device, just contact us at amazon! The module uses HID technology, no driver, plug and play. Supports WIN7 / XP 32/64 bit systems, easy to use and simple. High performance USB controller chip, military grade PCB board production. 5V relay, the relay can control the maximum 250V 10A AC load and 30V 10A DC load. Reserves 4, 8-way power interface, connected to the power, even if the computer is off the computer or disconnect the USB plug, you can also relay remains set. 1-way and 2-way no power connection.