The QTRX-HD-13A Reflectance Sensor Array is an analog, 13-channel distance and reflective sensor manufactured by Pololu. It operates on a voltage range of 2.9 to 5.5 VDC and offers individual LED and phototransistor pairs for each channel. The LED and phototransistor pairs allow for accurate segmented IR reflective sensing, providing up to 13 different reflective/proximity values. This sensor can be used for line/edge detection, object detection, hole detection, and obstacle detection, among other applications.