NOTE: This product is intended for USB interface pressure testing purposes only and must not be used for any illegal or unethical activities. It is designed solely for testing and research applications. The seller assumes no responsibility for any disputes or adverse consequences arising from its use. Please consider this carefully before purchasing. The product connects directly to a compatible USB interface and will automatically discharge upon connection. Users should record measurement data using external measuring instruments during discharge. It is recommended that the connection duration does not exceed 10 seconds. In extreme conditions, operating time should not surpass this limit. Due to the high component density in a compact area, heat generation is significant. Without adequate heat dissipation or forced cooling, prolonged operation is not advised. This device is compatible only with computer motherboards, industrial control equipment, and testing instruments featuring discrete power supply systems with USB TYPE-A interfaces. It is not suitable for Micro-USB, USB Type-C, Lightning, or pin-dense interfaces. Operational Precautions: Avoid using or storing the product in environments exceeding temperature limits, high humidity, or excessive dust. Do not subject the device to strong impacts or bending. Disassembly of the product is strictly prohibited. Safety Precautions: Keep this product out of reach of infants and young children. Although it contains no internal battery, it generates high voltage during operation. The booster circuit outputs a fixed 300V; when connected to a load, the voltage drops to an average of 230V with a tolerance of ±30V. Do not remove or damage the heat-shrink tubing covering the device, which is rated for 600V insulation. If the heat-shrink tubing is damaged, discontinue use immediately. In case of abnormal conditions such as irregular output voltage (too high or too low), unusual noises, overheating, or smoke/fire, disconnect the device immediately. This product is a test instrument capable of sustained voltage output based on a Boost converter structure. It draws input power directly from the USB port (5V 1A or higher). No external charging is required, but it requires a stable USB power source: output voltage must be 5V with no more than ±20% deviation, and current output must be at least 1A. Failure to meet these requirements may result in malfunction. Color: Yellow + Silver Material: Plastic + Metal Package Contents: 1 x USB Testing Device The package includes only the items listed above; all other accessories are excluded. Note: Lighting conditions and display settings may cause slight variations in the perceived color of the item compared to the actual product. Measurement error allowance is ±1–3 cm.