The Zumo Robot Shield can be fitted with a Reflectance Sensor Array that allows it to solve different line/maze style problems.
The Zumo Robot is fitted with a set of Inertia Sensors that can be used to detect collisions and determine bearings/direction. The later 1.2v of the Zumo Shield includes a Gyroscope.
The Pololu Zumo Robot is a dual motor rubber tracked robot that fits inside the 10cm x 10cm rule for Mini Sumo Robot Competitions.
The Zumo Robot shield comes with a buzzer that can be used to signify events or actions.
The Zumo Shield libraries provide basic motor operation consisting of PWM speed control and direction.