The QTRX-HD-13RC Reflectance Sensor Array with Distance Sensor from Pololu is a digital reflective sensor with 2.9-5.5V supply voltage. It has thirteen channels, each providing digital output when a reflected object is detected. This device is ideal for robotics applications, helping them to detect nearby obstacles or to build complex reflectance systems. It can also be used for following printed line tracks, detecting color or texture changes, and detecting objects.