The Zumo reflectance sensor array provides an easy way to add line sensing or edge detection to a Zumo robot. It features six separate reflectance sensors, each consisting of an IR emitter coupled with a phototransistor.
This combination deal contains most of the parts you need to build an Zumo Arduino robot. It consists of a Zumo Shield for Arduino, a Zumo chassis kit, and a Zumo blade. This programmable robot can be used as an autonomous robot.