This product is designed for use with computer motherboards, industrial control equipment, and testing of measuring instruments, as well as other discrete power supply systems. It features a USB Type-A to Micro-USB, USB Type-C, and Lightning interface with a pin-intensive design. Operational precautions: Avoid using or storing the product in environments with excessive temperature, humidity, or dust. Do not subject it to impact, crushing, or bending. Do not attempt to disassemble the device. No charging required. Do not operate for more than 10 seconds continuously to prevent overheating. Do not connect to a charging adapter or power source. Not intended for use with lithium-ion battery packs. Note: This product is intended solely for USB interface stress testing. It must not be used for any illegal or unethical purposes. For testing and research use only. The seller assumes no responsibility for any disputes or adverse consequences. Customers should carefully consider before purchase. This is a USB high-voltage pulse generator. It is not a USB flash drive. Use only with a certified and legitimate power source for testing. The third-generation model outputs between -300V and -500V. The device connects directly to a USB port and automatically discharges. Users should record measurement data using external test instruments during discharge. Connection time should be kept under 10 seconds. In extreme conditions, do not exceed the recommended operating time. Due to the high component density in a compact area, heat dissipation is limited. Without adequate cooling, prolonged operation is not advised. Color: Black-Gray Material: Metal Package Contents: 1 x USB Pulse Generator Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.