Instructions: 1. Connect a 5V power supply or a power bank to the -usb power interface, plug one end of the USB cable to be tested into the USB interface, and plug the other end into the corresponding interface. Press the reset button on the test board, the tester starts to work. 2. The four LED lights on the tester will . If any lights do not , it means that the signal line has an open circuit fault. Then the LED lights will sequentially from left to right. If the lighting sequence is , it indicates that the wire has a reverse welding fault. 3. If two LED lights are lit at the same time when they are lit sequentially, it means that the two lines have a short-circuit fault. 4. The buzzer will emit a "beep" tone, and the last four lights will again, and the test is complete. Color: green Material: PCB board Package Contents: 2 x USB cable tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Advanced chip makes sure precise measurement. This tester supports Type-c, Mini usb, Micro-usb three interfaces. Multi-level protection ensures the stability and of testing. It can test the USB data cable open circuit, short circuit and wire material welding error and other faults. Bee cue and indicator lights remind you of fault types.