This tester supports Type-c, Mini usb, -usb three interfaces. 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. Advanced chip makes precise measurement. Multi-level protection ensures the stability and safety of testing. Instructions: 1. a 5V supply or a bank to the -usb 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 light up. If any lights do not light up, it means the signal line has an open circuit fault. Then the LED lights will light up sequentially from left to right. If the lighting sequence is , it indicates the wire has a reverse welding fault. 3. If two LED lights are lit at the time when they are lit sequentially, it means the two lines have a short-circuit fault. 4. The buzzer will emit a "beep" tone, and the last four lights will light up again, and the test is complete. Color: green Material: PCB board Package Contents: 1 x USB cable tester Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.