This tester supports Type-c, Mini usb, -usb 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. 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 the signal has an open circuit fault. Then the LED lights will 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 same 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 again, and the test is complete. Color: green Material: PCB board Package Contents: 1 x USB cable tester Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.