This product is designed for use with computer motherboards, industrial control equipment, testing instruments, and other discrete power supply systems or their components. It features a USB TYPE-A interface and is not compatible with micro-USB, USB Type-C, or Lightning connectors. The interface is pin-intensive. Operational precautions: Avoid using or storing the product in environments with excessive temperature, humidity, or dust. Do not subject the product to strong impacts, crushing, or bending. Do not attempt to disassemble the device. No charging is required. Do not operate for more than 10 seconds continuously to prevent overheating. Do not connect to a charging adapter or power source. Avoid prolonged usage to maintain device safety and performance. Note: This product is intended for USB interface stress testing and diagnostic purposes only. It is not a USB flash drive. It is a USB high-voltage pulse generator. Use only with approved testing equipment and legitimate power sources for testing purposes. The third-generation model generates an output of -300V to -500V. The device automatically discharges when plugged into a compatible USB port. Users should record measurement data using external testing instruments during discharge. It is recommended to limit connection time to under 10 seconds. In extreme cases, operation should not exceed 30 seconds. Due to the high component density in a compact area, heat builds up quickly. Without adequate heat dissipation or forced cooling, do not exceed the recommended operating duration. Color: Black-Gray Material: Metal Package Contents: 1 x USB testing device Note: The package includes only the items listed above. Other accessories are not included. Light reflection and display differences may cause slight variations in color appearance.