This kit uses QTI infrared emitter/receiver modules to easily enhance the line-following capability of your Boe-Bot robot. Mount three or four sensors underneath the Boe-Bot chasis, and adjust the position to detect lines of different widths. Learning to use the QTI is easy with the illustrated instructions and example BASIC Stamp code provided. This kit includes all the circuit and sensor hardware you need to add QTIs to your Boe-Bot