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It reinforces the control commands of the input pins and give it to the eight output pins. This happens via 4 H-bridges. The output pins have clamping connections and they are labeled with M1, M2, M3, M4. Ensure sufficient voltage and current to the VCC and GND terminal. It can control 4 DC motors or 2 stepper motors. It also has 2 power connectors. It fits directly without tinkering on an Arduino UNO, Duemilanove or MEGA.