Features 1、D1-D8 mark on the module correspond to 8 sensors from left to right, clear and easy to read 2、D1-D8 output mode is analog quantity, normal high level after power on, very stable 3、Use obstacles to cover the sensor, according to the distance of the obstacle, the voltage value of D1-D8 will decrease, and the range of change is within 1V 4、The product come with wide applications, include robots, smart cars, laboratories, DIY 5、Adopt good‑quality resin material, possess environmental protection, heat resistance, low temperature resistance Specification Item Type: 8bit Tracking Module Material: Resin PCB Board Size: Approx. 67 x 17mm / 2.6 x 0.7in Fixed Hole Diameter: Approx. 3mm / 0.1in Number of Sensors: 8Pcs Application Range: 1. Robot 2. Smart car 3. Laboratory 4. DIY Package List 1 x 8bit Tracking Module