This USB line tester is a compact tool for testing USB cables. It supports two power supply modes and has LED indicators for easy connection status display. The test board is simple and intuitive, making it easy to test USB cables for iOS and Android devices. The short circuit on-off switch provides reliable testing of USB cable connections. The device is made of PCB material, is black in color, and has a compact size of approximately 10*10*2CM/3.94*3.94*0.79inch.