Features: Quickly detect abnormal data lines. If the light is on, it indicates normal power on, and if it is not on, it indicates abnormal power on. Multi-level for protection ensures the stability and safety of testing. Small and convenient, fast detection, easy to carry. After connecting the power supply from the power supply port, insert the test line into the corresponding input port. If the 4 lights are on, it means that the power is normal, and if they are not on, it means that the power is abnormal (if the double for head type-C connection is normal, it means that the 5 lights are all on) Specifications: Material:PCB Mixed Size Color:as the Picture Show Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 1 x USB Data Cable Test Board