This is an EZ-Robot Certified Economy Motor Controller. It is capable of 1.5 Amps (5 Watts) between 5 and 12 volts DC. This convenient motor controller connects to the EZ-B by a single cable.
The cable to the EZ-B provides +5, GND and Signal for the Motor Controller Communication
The other connections are for your motors and motor power.
* The IC will get very hot if your motors are drawing too much current. Consider adding a heat sink to the top of the chip: DigiKey Heat Sink