YDLIDAR X4PRO is a 360 degrees two-dimensional rangefinder (hereinafter referred to as X4PRO) developed by EAI team. Based on the principle of triangulation, it is equipped with related optics, electricity, and algorithm design to achieve high-frequency and high- accuracy distance measurement. The mechanical structure rotates 360 degrees to continuously output the angle information as well as the point cloud data of the scanning environment while ranging.