It is a 5V 3 Channel Infrared Line Track Tracking Tracker Sensor Module For Arduino AVR ARM PIC. Pin Definition: VCC            Voltage Supply ( 5 V) GND            Ground L                  Signal from L infrared sensor     (high / low) C                 Signal from C infrared sensor (high / low) R                 Signal from R infrared sensor (high / low) Features: 3 channel tracking sensors, must have in your Arduino DIY Robot Projects; Uses infrared light detection, anti-jamming capability, using CTRT5000 sensor, adjustable sensitivity, stable performance; Working voltage : 5V With lights, a fixed bolt hole for easy installation Package Includes: 1 x 3 Channel Path Tracing Module SKU: PGI-00699505 Category: IR And PIR Sensor