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 to a USB interface and will automatically discharge when plugged in. Users should record the required measurement data using external measuring instruments during discharge. It is recommended that the connection duration does not exceed 10 seconds. In extreme cases, prolonged operation beyond this time is not advised due to the high component density in a compact area, which may lead to noticeable heat buildup. Without adequate heat dissipation or forced cooling, exceeding the recommended operating time should be avoided. This device is compatible only with computer motherboards, industrial control equipment, and testing instruments with discrete power supply mainframes equipped with a USB TYPE-A interface. It is not suitable for Micro-USB, USB Type-C, Lightning, or any pin-intensive interfaces. Operational precautions: Avoid using or storing the product in environments with excessive temperature, humidity, or dust. Do not subject the device to strong impacts or bending. Disassembly of the product is strictly prohibited. Safety precautions: Keep the product out of reach of infants and young children. Although it contains no battery, the device 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-shrinkable tube insulation provided on the product (rated for 600V withstand voltage). If the insulation is compromised, discontinue use immediately. In the event of abnormal conditions such as irregular output voltage (too high or too low), unusual sounds, overheating, or smoke/fire, disconnect the device immediately. This product is a test instrument capable of sustained voltage output based on a Boost converter design. It draws input power directly from the USB interface (5V, 1A or higher) and does not require separate charging. However, it requires a stable USB power source: output voltage must be 5V (within ±20% tolerance) 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 not included. Note: Lighting and display settings may cause slight variations in the color appearance compared to the actual product. Measurement error allowance is ±1–3 cm.