This is a Mechanic DT3 USB Cable Tester Board, a compact diagnostic tool designed to quickly check the integrity, connection lines, and internal shorts of various USB charging and data cables. It features an onboard micro-USB or Type-C power input port that feeds electricity across specific diagnostic traces to illuminate clear LED indicator lights. It serves as an essential tool for smartphone repair technicians, hardware engineers, and DIY hobbyists to isolate faulty cables instantly.