Robot tank tracks Chassis including 2 motors (OT3452)

L9110 Connected and IncludedOperating Voltage: 3V - 12VOpto Coupler Speed Sensor is IncludedChassis Kit, Belts, Motors Are IncludedMotor Operating Voltage: 3V - 8VMotor Max Torque: 1.5kg.cm at 7.2VMotor Speed Without Load: 250 rpm/m at 7.2VMotor Load Current: 250mA at 7.2V Pin Description:GND: Ground Connection of LM393 and Speed SensorVCC: Power Connection of LM393 and Speed SensorIA & IB: Motor Driver L9110 InputSPEED: Output of Speed SensorM.P-: -ve Power Supply of L9110 and MotorM.P+: +ve Power Supply of L9110 and MotorDimensionsLength: 20cmWidth: 11cmHeight: 5.3cm