3pcs 1-channel Infrared Reflection Tracking Sensor Module Smart Car Black/White Line Detection Features: This module provides a versatile infrared detection system solutions for automation machinery devices.  It uses TCRT5000 infrared reflection sensor whose infrared emitting diodes are constantly emitting infrared rays. When the infrared ray emitted is not reflected back or intensity is not high enough, the infrared receiving tube is in the off state and module outputs low level,while indicating diode is off. When object is in detecting range, infrared ray will be reflected back with high intensity, the module outputs high level and indicating diode is on. Widely used for electricity meter pulse data sampling, fax machine paper detection, obstacle detection, black and white line detection. Specification: Detection Reflecting Range: 1mm~25mm Working Voltage: 5V Output Form: Digital signal (0 and 1) PCB Size: 3.5*1cm / 1.4*0.4in Weight: 8g / 0.3oz (approx.) Wiring Method: VCC: Power supply positive (5V) GDN: Power supply negative OUT: High/low level on-off signal (digital signal 0 and 1) Package list:  3 * Infrared Tracking Sensor Modules